1. AA*2 power External Amplifier Battery box, black color, size: 75*45*19(MM)
2. Amplifier IC: 2822 (Max. 3W~5W)
3. Function: Power Switch, LED
4. Wiring: Inputs 3.5 stereo sound straight heads, line long 30CM, 

Outputs 3.5 three-dimensional initial consonant heads, line long 30CM