I needed a radio for work and build a bluetooth speaker out of an old ammo tin and some other parts I had laying around. The amplifier board puts out 30 watts per channel and has a built in bluetooth card. There is a 1/8" aux jack too incase you can't use bluetooth. The speaker is being powered by four 18650 cells that I recycled out of a lap top battery. I had it running for over 12 hours and the batteries kept going and going. Might have to add a USB jack to charge my phone while in use.
Dale P.
Dale P.