This wireless amplifier is a splash-proof 300 MHz band. Microphone input x 1, external input x 2, and 1 300 MHz wireless tuner for mixing 4 inputs. and you can also combine 2 additional wireless tuners with up to 6 inputs mixing broadcast. Built-in CD player (with SD/USB). By connecting with an application cord, it has a synchronous drive function that allows you to mix two audio amplifiers and spread out from both wireless amplifiers. A portable splash-proof amplifier with built-in speaker with a fixed handle that can be used with AC 100 V, AA batteries x 10 and a dedicated NiCad electrical material, and 4 power supplies.