i.Fuzen HP-1 # - Sharp - White

iPhone 4/4S Case with Built-in Headphone Amplifier, Splitter and Extended, Rechargeable Battery


We apologize

This item has been discontinued

Get FAST answers from customers ASK a Question See questions answers

Increase Your iPhone's Battery Life

Double Your iPhone's Battery Life

The HP-1 has a powerful 1650mAh on-board backup battery which can nearly double the battery life of the iPhone 4/4S. The unique Smart Battery Protection circuit continuously monitors and optimizes the power performance of your iPhone, and an independent LED indicator keeps you informed of the remaining life of the secondary battery. The new "auto shut-off" feature will help preserve your battery life by switching off once the iPhone is fully charged.

Headphone Splitter

Headphone Amplifier & Splitter

The i.Fuzen HP-1 allows you to share your music with a friend by splitting the single headphone jack into two. The proprietary J-FET OP-AMP amplifier is powerful enough to drive two pairs of standard headphones or one pair of professional monitoring headphones while maintaining vacuum tube quality sound, making the HP-1 the ideal choice for audiophiles and music lovers alike. The new and improved amplifier will allow you to enjoy the headphone amplifier while your iPhone charges.

iTunes Sync

Unrestricted iTunes Sync

With full USB pass through capability, this case will allow you to sync flawlessly with iTunes without the need to remove the iPhone. The mini USB input also increases your options if you are in need of an emergency charge, but do not have access to a dock connector cable.

Innovative Design

Innovative Design

The i.Fuzen HP-1 takes advantage of the features and style of the iPhone 4/4S. The relatively sleek case accentuates the iPhone's distinctive lines while minimizing the increase in overall size. The HP-1 is available in white and black, allowing you to easily match the case to your iPhone.

Cell Phone Case Features:

  • Proprietary Auzentech Headphone Amplifier
  • Dual Headphone Output port to share your listening with your friends
  • ZX-Driver provides Ultra-Low Distortion and Max 180mW output power
  • J-FET OP-AMP to provide Vacuum Tube like sound output
  • Proprietary Auzentech Balanced Power Supply
  • Sound Mode, Selector button & Status Indicator
  • Touch panel volume control
  • Unique & compact design to match your iPhone 4 look
  • Impressive 1650mAH Li-Polymer battery with Smart protection circuit
  • Improved Sharp Version adds innovative features
    • Unlimited headphone amp usage while your iPhone is charging
    • Headphone amp will not charge iPhone while in use for extended usage
    • Automatically shuts off once iPhone is fully charged to extend battery reserve power
  • 4-Steps LED battery life meter and battery life check button
  • Charge via USB port (from desktop PC or Laptop) with supplied USB cable
  • Supports USB pass through, iTunes Sync
  • Last up to 500 full charges
  • Color: White
  • Also available in: Black
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
iFuzen HP1 battery life chart

Device Specifications:

  • Battery Life: 1650 mAh
  • Supports USB pass-through
  • Output voltage: DC 5V
  • Output current: 500 mA
  • Maximum Input current: 800 mA
  • Output Power: 180mW (90mW + 90mW @ 32 Ohms
  • Frequency Response: 5Hz - 100kHz, +/- 0.23dB
  • Input Sensitivity: 1.25V RMS
  • Maximum Gain: +9dB
  • Input Impedance: 50 kOhms
  • Load Impedance: 32 - 600 Ohm
  • Total Harmonic Distortion: 0.002%,@ 1kHz into 32 Ohms
  • Signal to Noise Ratio: 113dB (A-weighted)
  • Product size : 62.7mm(W) x 133.4mm(H) x 15.3mm(D)
  • Weight: 70g

Battery Specifications:

  • 1650mAh rechargeable lithium polymer battery
  • DC 5V/500mA Power output
  • Audio playback Up to additional 44 hours
  • Video playback Up to additional 11 hours
  • Talk time Up to additional 8 hours

Headphone Amplifier Specifications:

  • 180mW Headphone output power
  • 32 - 600 Ohm Load impedance
  • 113dB(A-weighted) Signal to noise ratio

Compatible Cell Phones:

  • iPhone 4
  • iPhone 4S

Key Features And Comparison Chart

Unlimited Headphone Amp Usage While Charging
Longer Headphone Amp Usage
Auto Shut-Off To Extend Battery Reserve
4-Step LED battery life meter
Touch panel volume control
USB Input For Increased Charging Options

Product History:

i.Fuzen HP-1-SHARP-WHITE thumbnail
(newest, current model)
i.Fuzen HP-1-WHITE thumbnail
(previous model, replaced by i.Fuzen HP-1 # - Sharp - White)

Charger Specifications

Charger Type
The type of charger defines where the charger is designed to be used.
Portable Battery Charger
Charging Ports
These are the connection port that the charger is able to connect to. USB charging is the most common because it is able to connect to so many different types of ports.
Apple Connector (30-pin)
Included Cables
These are the adapter cables that are included with the charger.

Compatible Devices

Compatible Devices
This feature tells you if this dock will be compatible with iPhone, Android or other operating systems.
iPhone 4/4S

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Randy Mack

Altus Oklahoma

Hi Fi on the go!!!

August 14, 2014

Very awesome product...speedy shipping...great with the new firmware..
Awesome sound!!!

6 of 8 found this helpful

Was this review helpful to you?

Hide answersShow all answers | Sort by
No questions have been asked about this item. Be the first!

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: i.Fuzen HP-1 # - Sharp - White