This is a portable speaker built in amplifier that can be used with 3 power sources of AC 100 V, 8 AA alkaline batteries and a dedicated NiCd battery. Microphone input x 1, spare input x 1, and 800 MHz diversity wireless tuner is included for mixing 3 inputs. It can also be combined with 2 additional 800 MHz wireless tuners to allow for mixing broadcasting of up to 5 inputs. It can be built into a CD player, SD recorder unit, etc.