Sennheiser HDR 120

Over-Ear Wireless Headphones for RS110 and RS120 Wireless Headphone System


We apologize

This item has been discontinued

Get FAST answers from customers ASK a Question See questions answers

Sennheiser Audio Store

Sennheiser HDR 120 Over-Ear Wireless Headphones

The Sennheiser HDR 120 Headphones Offer an Incredible Listening Experience

The Sennheiser HDR 120 RF wireless headphones are an inexpensive supplementary or expansion set, operating in the 863MHz or 926MHz variant frequency range, and designed for use with Sennheiser's RS 120 Hi-Fi or television wireless headphone monitoring system. These headphones feature extended low frequency reproduction, a supra-aural, open-back design, and NiMH rechargeable battery operation with a 20 - 25 hr. battery life. The HDR 120 are a replacement or additional headphone for wireless headphone systems RS 115, RS 117, RS 119, RS 119-II, RS 120, RS 120-II.

Audiophile, Premium, Best In-Class, Sennheiser

Sennheiser is a name that is synonymous with audiophile products. They have been viewed as a premium, top-tier (dare we say "The" top-tier?) brand since the beginning of time. Laboratorium Wennebostel's time that is. In 1945, Prof. Dr. Fritz Sennheiser founded Laboratorium Wennebostel's, or "Lab W" in a pleasant half-timbered house. Fritz Sennheiser was born with a gift. When he was 11 years old, he saw an early radio that inspired him to build a crystal radio. Again, he was 11 years old. There was no turning back from that day. The following year after founding "Lab W", Sennheiser produced his microphone. From that point on, it was one success story after the other. Sennheiser's technology continued to improve, and "The Bar" continued to rise. In the mid 60's, Sennheiser released the HD 414, the world's first "Open Headphones". That very day changed the future of headphones forever. That very same headphone, the HD 414, not only helped establish Sennheiser as a leading headphone manufacturer, but it sold over 10 million units. It is the best selling headphone of all time, and Sennheiser had just gotten started.

What's In The Box?
  1. Sennheiser HDR 120 Wireless Headphones
  2. 1-Pair of NiMH Rechargeable "AAA" Batteries (x2)
  3. Owners Manual & Operating Instructions
  4. Authorized 2-Year Warranty

Product Note: For use with the Sennheiser RS 115, RS 117, RS 119, RS 119-II, RS 120, RS 120-II Wireless Headphone Systems. The HDR 120 was designed to be an additional/replacement headphone for these wireless headphone systems. Is not intended for use without either of these systems.

General Features:

  • Over-Ear Wireless Headphones for RS110 and RS120 Wireless Headphone System
  • Wireless freedom and stereo sound with reception through walls and ceilings up to 328 feet
  • Over-ear design
  • E.A.R. (Ergonomic Acoustic Refinement) for excellent accuracy and clarity
  • Neodymium magnet system for dynamic frequency response
  • Gloss burl wood parts for sophisticated finish
  • Lightweight aluminum voice coils
  • Duofol diaphragms for transparency and minimal distortion
  • Extremely comfortable velour ear pads and headband
  • Surround reflector for extended spatial sound field
  • Adjustable headband for comfortable listening sessions
  • Sennheiser HH 10 Universal Holder (Mount) Available
  • Item Reference # 009931
  • Main Color: Black
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Product Specifications:

  • Frequency Response: 22-19,500 Hz
  • Sensitivity: 106 dB
  • Nominal Impedance: 24 Ohms
  • THD(Total Harmonic Distortion): <0.1%
  • Magnet Material: Neodymium

Headphone Design

Headphone Type

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Headband Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.
Headphone Application

This is the application that the headphones are designed for. Each application has unique features that make it perfect for particular uses.

DJ: These headphones are durable, loud, and will often allow for one ear listening.

Gaming Delivers explosive sound and allows you to communicate with others.

Home Hi-Fi: These audiophile headphones are engineered to produce high fidelity and accurate audio.

Home/Office: These headphones are designed to produce rich, brilliant sounds that the artists would appreciate.

Sports: Designed for active use. These headphones are made to stay in (or on) the ear during workouts.

Kids: Feature noise limiting technology so that your little ones don't damage their ears listening to music too loud.

On-the-Go: On-the-go headphones are lightweight and often fold up for easy storage and portability.

Student: Compact and rugged enough to survive life in a backpack; inexpensive enough to not hurt the wallet of a student.

Studio: Reproduce music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Traveler/Airplane: These headphones are compact, lightweight, and have a portable design.

TV & Movie
Acoustic Principle

The basic design of the headphones. There are 3 different types:

Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source.

Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room.

Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.


General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Bluetooth means that the audio signal is transmitted from your device to the headphones via a Bluetooth connection.

Corded or Bluetooth means that the headphones can be used as corded headphones or as Bluetooth headphones. They have an input in one or both earcups for use as a corded headphone while they also have a built-in battery for use as Bluetooth wireless headphones.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

Home/RF Wireless
Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Connector Type
The type of connection the headphones use to connect to receive the audio signal from a music source. Traditional headphones use an analog 3.5mm headphone jack. Newer technology has allowed digital signals to be sent directly to the headphone using an Apple Lightning or USB-C cable.
Color Shades
Primary color shades of the headphones.
Refers to materials used to build the headphones. Most headphones are built from some combination of plastic and metal to give you a durable pair of headphones.
Ear Cushion/Earbud Material
Refers to the material that the ear cushions/earbuds are made from. Ear cushions and earbuds are available in a variety of materials, ranging from basic rubber eartips to plush leather ear cushions intended for maximum comfort.
Water Resistant
This refers to the level of water resistance of the fitness tracker. Some fitness trackers are water resistant and can be used while swimming, while others are only splash proof or should not be used near the water.
Refers to whether a pair of headphones can be folded up. These headphones feature hinges in the frame above the earcups that allow the headphones to neatly fold into a much more manageable size. Folding headphones are perfect for anyone who spends a lot of time traveling and needs a compact pair of headphones that can fit in their bags.

Gaming Headphones

Wireless Type
Refers to the wireless connection type used by these headphones.

Home Wireless Headphones

Wireless Type
Refers to the wireless connection type used by these headphones.
Wireless Range
The maximum distance the headphones can be from the hub and still work in feet.
328 feet

Audio Features

Driver Type

The physical design of the driver in the headphones.

Balanced Armature:
A balanced armature driver uses a coil wrapped around an armature which is held in between two magnets until it is stimulated by an electrical current. When stimulated, this armature is magnetized which causes it to rotate one way or the other around a pivot point which moves the diaphragm to create sound. Balanced armature driver headphones are generally earbuds and can have multiple drivers in each earbud.

Dynamic drivers are the most common driver type. They feature a permanent magnet, usually neodymium, a voice coil and a conical diaphragm to drive your music. A dynamic headphone driver looks pretty much identical to any typical home theater speaker.

Electrostatic drivers are made up of an extremely thin membrane, usually a coated PET film, stretched between two metal plates. An electrical signal is applied to the metal plates to create an electrical field which, depending on its polarity, draws the speaker diaphragm toward one of the plates which forces air through the perforations in the diaphragm which generates the sound wave.

Planar Magnetic:
A planar magnetic driver is made up of a large membrane suspended between two sets of oppositely aligned magnets. An electric charge is applied to the membrane to induce movement and produce sound waves.

The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
24 ohms
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
106 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
22 - 19500 Hz
Audiophile headphones represent some of the finest headphones available. Audiophile headphones produce genuinely outstanding sound quality as well as extraordinary build quality, components and comfort. They are truly the finest headphones available.
Built-in Amplifier
This refers to whether the headphones have an amplifier built-in.

What is in the Box?

Main Product
The main product in the box.
Sennheiser HDR120 Wireless Headphones
Accessories included with the headphones
Replacement Battery
Paperwork included with the product.
User manual
Warranty/Registration card

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Santa Clara, CA

Very Clean Deal

October 30, 2014

The product delivered was exactly as advertised and received in a timely manner.

62 of 74 found this helpful

Was this review helpful to you?


Little Rock, ar

Wonderful to hear and understand

December 29, 2014

I was not able to hear or understand all the words, especially in a movie. Using the headset I can hear and understand all of the movie or program. You can set your own volum and not bother others.

58 of 70 found this helpful

Was this review helpful to you?


Columbia, KY

Great headphones

February 7, 2014

I purchased these headphones for watching television without disturbing the whole house. They have excellent sound quality (what else would you expect from Sennheiser?) You can't beat the price on any other quality headphone.

56 of 68 found this helpful

Was this review helpful to you?



Love These

October 1, 2013

If you are reading this then your interest is placed correctly! For the price these headphones sound amazing. The first pair of open eared headphones I own, I had too many questions about how they would sound, what they would fit like, how much the people around me would hate me.

54 of 64 found this helpful

Was this review helpful to you?

Joan Z

Conyers, GA

Excellent product

October 31, 2014

We already had one pair of these headphones that worked well but when the battery died, it took awhile for them to recharge. Now my husband has a spare. As with the original, the headpiece seems a little large but it's great having a second set without having to wait or buy another charging unit.

53 of 64 found this helpful

Was this review helpful to you?


Aurora Colorado

exactly what I was looking for

September 2, 2014

Purchase these headphones several years ago for my parents. My Dad's set finally broke. I will continue to buy these headphones. Great headphones for the price.

54 of 66 found this helpful

Was this review helpful to you?

herby derby


super product with a super deal.

October 4, 2014

i love the headphones. i use them every day and they never fail me. i like the rechargeable ones. so comfortable and clarity is awesome. i have a hearing problem and they keep my tv at a comfy volume for others. i have three pairs and would buy another when needed. thank you for the great deal.

53 of 65 found this helpful

Was this review helpful to you?


Los Angeles, CA

Great headphones

September 7, 2014

I bought this pair to replace the same model that I had been using for a few years. Great sound quality. Only downside is that the headphones are a little bulky.

52 of 63 found this helpful

Was this review helpful to you?


San Diego.Ca

Great product at a reasonable price

December 19, 2013

Last year, 2012 I wanted a good set of headphones to enjoy my movies late night while everyone's sleeping. They took 2 mins to setup. When I turned them on, after a full charge, I was impressed with the clarity of the highs. The bass is deep and smooth. Even at lower volume levels. I thought I was in a movie theater. The surround sound is incredible. I have a two story home about 1700 sq ft and I could not find any place in the house, or garage, where I experienced signal loss or a degrade in performance. They also hold a charge all day. Watched 3-2hr +movies and still had enough for several hrs of TV. They are pretty light and very comfortable too. This year I am buying another set for our TV upstairs so my (hard of hearing) wife can watch her shows, as loud as she wants, without interrupting my daughter's or my tv viewing in other parts of the house.

49 of 59 found this helpful

Was this review helpful to you?


durango, CO

no sound in headphones without some sound coming from the tv

April 29, 2015

headphones worked in the store without tv sound, but at home with my 9 year old Sony TV, could not get sound through headphones without some sound coming from the TV. abyone know what gives?

32 of 37 found this helpful

Was this review helpful to you?


New York, NY

Excellent and convenient

May 8, 2015

To listen to TV programs without annoying a spouse who may prefer silence these ear phones are a godsend. If one is hard of hearing, one can adjust volume without blasting those with better ears. Sennheiser's usual excellence in sound quality nis evident. I own and have owned several of their products. Getting the right volume and clarity may take good fingernails--the only tricky part of "tuning" these headphones I've found.

28 of 34 found this helpful

Was this review helpful to you?



Senheiser wireless Headphones

November 21, 2015

Excellent product, fantastic sound, looks good, great value. We bought
our first set - transmitter and headphone - in June 2012. In October 2015 purchased a second set of Headphones. Should have done some
price research. For less than what we paid for the Headphone alone
we could have had the transmitter and phone combination, this would have given us a extra transmitter for the bedroom,- 0h well - - -

0 of 1 found this helpful

Was this review helpful to you?

Accessory Tools and Products

Accessories added

Limitless Creations HPCX2

Universal Headphone Case for Large/XL Over-Ear Headphones

Your Price $12.99

Browse 6 questions and 32 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Recommended by my son.
Linda B on Dec 2, 2016
it works as advertised
Charles N on Sep 1, 2015
Jeff R on Nov 23, 2016
I really like them. Sadly I stepped over mine and broke them so getting a replacement.
Wilbert Sequeira S on May 27, 2015
Will Sennheiser HDR120 work with my HDR-126 ?
Jean-Guy T on Aug 7, 2014
Best Answer: I chose these headphones based on the rating, the company and my needs. I have a husband that is hard of hearing and he loves these for watching TV late at night.
Reply · Report · Diana L on Dec 4, 2014
· Add Answer · I Have This Question Too (2)
what kind of batteries should I use? I have the charger and they sit on the charger when I'm not using them.
A shopper on Apr 25, 2015
Best Answer: My headphones came with GP NIMH rechargeable AAA 1.2 V batteries. They are available at Office Max for about $11 for a pair (Duracell brand).
Reply · Report · Nollie S on Apr 25, 2015
· Add Answer · I Have This Question Too (1)
Are These factory new headphones?
Richard B on Dec 4, 2014
Best Answer: Yes these are factory new headphones and they are great, and well worth the money
Reply · Report · Diana L on Dec 4, 2014
· Add Answer · I Have This Question Too (1)
how do you recharge the batteries ?
A shopper on Jun 30, 2015
Best Answer: If you have them on, then move them ahead of your face and with your right hand, turn the left earpad counterclockwise, that'll release the pad and the batteries will be inside.

IMPORTANT: Batteries MUST be rechargable, since the unit recharges when you put it on the base. Also, please note that this is only part of a system that originally includes the base and this is a replacement in case you loose/break the one that came with the base. It wouldn't work by itself.
Reply · Report · Wilbert Sequeira S on Jun 30, 2015
· Add Answer · I Have This Question Too (0)
Does the HDR 120 come with a charger?
Walter M on Jan 15, 2015
Best Answer: No it does not come with the charger. I made that mistake as well? I had to buy the more expensive headphones they come with the charger, but you can use these on the charge as well. Both are well worth the money. To check them out I went into our bathroom and could still hear the TV clear as if I were in the room.
Reply · Report · Diana L on Jan 15, 2015
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number




Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Sennheiser HDR 120

Item Added to Cart

Sennheiser HDR 120

Over-Ear Wireless Headphones for RS110 and RS120 Wireless Headphone System


Keep Shopping

Get Added Peace of Mind with SquareTrade

Why SquareTrade?

  • The #1-Rated Protection Plan
  • 5-Day Service Guarantee & Free Shipping
  • Protection from Normal, Everyday Use
You have added a warranty
Add Warranty
3 years of protection

Limitless Creations HPCX2

Universal Headphone Case for Large/XL Over-Ear Headphones



Don't see the accessory you're looking for?
View all available accessories for the Sennheiser HDR 120.