JayBird JF4MBL Freedom Sprint - Midnight Black OPEN BOX COMPLETE

Lightweight, SecureFit Athletic Sports Style In-Ear Wireless Bluetooth Headphones

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The Perfect Gym Headphones

New and Improved Freedom Sprint

Almost everything in the Freedom Sprint earbuds has been enhanced. Taking the highly effective secure fit and high performance audio system from the original Freedom, JayBird has improved on practically every other factor, including the cord, made softer to lay exactly where you want it. The new Freedom Sprint headphones are over 40% smaller than the original Freedom and are compatible with any A2DP Bluetooth stereo device. If you’ve enjoyed Freedom, you are going to love Freedom Sprint.

JayBird Freedom Sprint Size Comparison

Don't Let Your Music Become Distracting

The last thing you want to worry about while you're working out is ear fatigue. To combat this problem, JayBird specially designed the the Freedom Sprint headphones to eliminate listener fatigue. To accomplish this, the Freedom Sprint headphones are tuned to emphasize the sub-bass while reducing the ranges of the mids and extreme treble that can cause listener fatigue. The result of this special tuning is warm, thumpy sound that lets you turn up the volume without your ears getting tired. In addition to eliminating ear fatigue, the Freedom Sprint has fumble-free on-ear controls. Because the controls are on the actual ear tip housing rather than the cable you don't have to worry about accidentally ripping the earbud out of your ears while fumbling with the controls in between sets.

Freedom Sprint Eliminates Ear Fatigue

Your New Gym Partner

Sweat resistance may not seem like the most important thing you want from a pair of headphones, but if you're going to be wearing them at the gym and pouring sweat into them you're going to be thankful for it. The sweat resistance rating of the Freedom Sprint headphones means you can play and train hard without worrying about sweat damaging or even destroying your headphones. To seal the Freedom Sprint headphones, JayBird designed a specialized gasket seal under full-time compression to give the controls and housing a water-tight seal.

Freedom Sprint Sweat Resistance

Comfortable Patented Sports Ear Cushions

Freedom Sprint Comfortable Fit

The Freedom Sprint headphones were built with JayBird's patented sports ear cushions to hug the top, back and lower surface areas of your ears to give you the most secure fit on the market. In addition to the secure fit, these headphones are also incredibly comfortable. It doesn't matter if the headphone drivers are tuned to reduce ear fatigue if they aren't comfortable enough for all day use. JayBird included 3 different sizes of eartips and ear cushion fins to give you 9 custom fit options; these headphones are perfect for any ear.

Item Condition: Open Box Complete

  • Opened and shows signs of use
    • General Features:

      • Freedom Sprint Wireless Bluetooth Headphones
      • In-ear design
      • On-ear music/call controls help avoid removing earbuds from ear
      • X-Fit Over/under-ear fit options
      • Signal Plus for skip free music outdoors
      • Jenna Voice prompts for easy use
      • Sweat-proof design
      • 4.5 Hour battery life from rechargeable Lithium Ion battery
      • Bluetooth Version: Bluetooth Class 2.1+EDR
      • Designed with a snug fit for active people
      • Includes different size tips for added comfort
      • Main Color: Midnight Black
      • Authorized Internet Dealer
      • 1-year Manufacturer's Warranty

      Product Specifications:

      • Frequency Response: 20-20,000 Hz
      • Sensitivity: 103 dB
      • Nominal Impedance: 32 Ohms
      • Cord Length: 1.2m
      • Bluetooth Version: Bluetooth Class 2.1+EDR
      • No. of Paired Devices: 2
      • Standby Time: 100 Hrs
      • Charging: USB (included)
      • Frequency Band: 2.4 GHz

      What's in the Box?

      JayBird JF4MBL Freedom Sprint What's in the Box?
      1. JF4 Freedom Sprint Bluetooth Buds (Midnight Black)
      2. 3 pair ear tips (S,M,L)
      3. 3 pair secure fit ear cushions (S,M,L)
      4. Optional ear hooks
      5. Standard Micro USB Cable
      6. Premium Protective Carry Case

    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.

    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.

    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.
    Device Controls & Compatibility
    Refers to the devices the in-line controls are compatible with.
    Universal Volume
    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.
    Built-in to Earpiece
    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.

    Bluetooth 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.
    Bluetooth Version Compatibility
    Which version of Bluetooth the device is compatible with. Is it important that the both devices being paired are the same version of Bluetooth. For example, a Bluetooth version 2.0 cell phone can be paired with a compatible version 2.0 headset.
    Version 2.1
    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.
    Protective Case
    Refers to whether a pair of headphones come with a protective case.
    Hardshell Case
    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.
    Ear Hooks
    These headphones feature hooks that wrap around your ears for a secure fit.

    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.
    32 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".
    103 dB
    Driver Size
    This refers to the diameter of the driver (speaker) on each side of the headphone.
    8 mm
    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).
    20 - 20000 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.
    JayBird JF4MBL Freedom Sprint Earbuds
    Accessories included with the headphones
    Carrying Case
    Replacement Ear Tips
    Paperwork included with the product.
    User manual
    Warranty/Registration card

    Warranty and Return Policy

    Parts Warranty Duration
    1 year
    Labor Warranty Duration
    1 year
    Warranty Provider

    Summary of Customer Ratings & Reviews

    Rating Distribution

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    Average Attribution Rating

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    Product Summary


    Model Number

    LS-Freedom Sprint (Midnight Black)-OBC



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    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: JayBird JF4MBL Freedom Sprint - Midnight Black OPEN BOX COMPLETE