The PWMBP1 is what you need to made any sound device wireless! Simply plug a microphone, CD player, MP3 player, etc. into the 3.5mm jack and turn on. Works great with out wireless receivers, like the PWMA830, PWMA850, and the new PWMA100. Also works with the Peavey 18019490 Pro Comm(R) system, the Fender Passport Wireless System, and any wireless receiver that runs on 174.8 mHz. Requires one 9V battery.