... DC 6V battery power,echo 4.ISO 9001,FCC,CE,Rohs 5.transistor:3035 high power Educational Equipment for Schools/Amplifier ... Function:1. The multimedia teaching audio power amplifier is simple ... and affordable but very high power output, you can use with 2*100W speaker, 8ohm,8",10" speaker. Frequency response 20Hz-20KHzMIC ...