Overview<br> This earphone phone amplifier is made of aluminum 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.<br> <br> Features: <br> Using aluminum alloy shell, feel comfortable, good heat dissipation.<br> The appearance is small and atmospheric, easy to carry.<br> There is an independent gain control switch. The operational amplifier is suitable for both positive and negative power supplies.<br> With 3.5mm input and output interface, suitable for connection of various types of smartphone computer equipment.<br> Built-in 600mAh rechargeable lithium battery, low power consumption, working time is about 8 hours.<br> <br> Specifications:<br> Input / Output Port: 3.5mm Studio input<br> Lithium Battery Capacity: 600mAh<br> Amplifier Usage Time: 8 hours<br> Working Voltage: DC3.7-4.2V<br> Charge Voltage: DC5V<br> SNR: more than 116db<br> Distortion: 0.001%<br> Output power: 32 Ohm 130mW<br> Load Impedance: 16-300 Ohm <br> Frequency Range: 20Hz-20kHz(+/-3db)<br> Item Size: 10*6.2*1.5cm / 3.94*2.44*0.59in<br> Package Size: 13*8*4cm / 5.12*3.15*1.57in<br> Package Weight: 132g / 4.66oz<br> <br> Package List<br> 1 * Headset Amplifier<br> 1 * USB Power Cable<br> 1 * User Manual<br> Notes: <br> There is a battery inside the machine, please do not open it privately.<br> Please do not use the machine at a high temperature and humidity environment.