Portable amplifier 1.Built-in USB,SD jack,18V battery 2. ... was designed with versatility in mind:Multi-media supported ,compact ,portable ,clear and loud sound reproduction ,well suited for any ... or 220V & create huge power to supply 160 watts' amplifier.4. Microphone echo transfer button.5. Install with Dual channels ... buit-in audio wirelessDimensions 280X320X560mmN.W.18KG PK-12M Portable amplifier