Overview
This earphone phone amplifier is made of alloy casing, which is comfortable to handle and has good heat dissipation performance. The appearance is compact and easy to carry, with a 3.5mm input and output interface, suitable for connecting all kinds of smartphone computer equipment.

Features:
Using alloy shell, feel comfortable, good heat dissipation.
The appearance is small and atmospheric, easy to carry.
There is an independent gain control switch. The operational amplifier is suitable for both positive and negative power supplies.
With 3.5mm input and output interface, suitable for connection of various types of smartphone computer equipment.
Built-in 600mAh rechargeable lithium battery, low power consumption, working time is about 8 hours.

Specifications:
Input / Output Port: 3.5mm Studio input
Lithium Battery Capacity: 600mAh
Amplifier Usage Time: 8 hours
Working Voltage: DC3.7-4.2V
Charge Voltage: DC5V
SNR: ≥116db
Distortion: 0.001%
Output power: 32Ω 130mW
Load Impedance: 16-300Ω
Frequency Range: 20Hz-20kHz(±3db)
Item Size: 10*6.2*1.5cm / 3.94*2.44*0.59in
Package Size: 13*8*4cm / 5.12*3.15*1.57in
Package Weight: 132g / 4.66oz

Package List
1 * Headset Amplifier
1 * USB Power Cable
1 * User Manual
Notes:
There is a battery inside the machine, please do not open it privately.
Please do not use the machine at a high temperature and humidity environment.