HiFi Headphone Amplifier
It can connect various audio players and mobile phones to process, amplify and output its audio signals, which can drive all kinds of earphones.

FEATURES：
Design is normally used to drive a headphone with a relatively high impedance.
Delicate, compact, lightweight, and portable.
Two-stage gain switch
USB Rechargeable lithium battery
Volume control

Note：
If you use for iphone to headphone amp,lightning to 3.5mm cable is not included, you need to buy it yourself

Specification:
Input: 3.5mm
Output:3.5mm
Capacity: 1050mAH（3.7V）
Amp Using Time: More Than 7-9 Hours
Working Voltage: 8.3V/1A
SNR>120dB
Distortion: 0.004%
Output Power: 40Mw in Impedance 16Ω
Headphone Impedance: 16-300Ω
Audio cable: 1m long, both male

Package Included:
1 x Headphone Amplifier
1 x USB Power Cable
1 x Audio Cable
1 x User Manual

Two-stage gain switch：
High/Low gain switch for optimal performance of the headphones.It enhances the signal input into the amp circuit for the optimal performance of the headphones.
Make it possible output not only louder sound but a sharper and more Real stereo sound without distortion.

Rechargeable lithium battery：
Built-in 1050mAh Rechargeble Battery, Charge by Micro USB Cable, More Convenient to charge.
It is not recommended to use while charging because current disturbance will occur when charging.