Portable Wireless Amplifier, With USB Card MP3 Player, with ECHO control... Portable Wireless ... .2AExternal DC Power:12V/1.2A(pechergeable Battery)Frequency Range:VHF 165-270MHz 1 channel Oscillating Mode:Quartz control phase locked ... maxDimension:180*110*290mm In the box:JX-628U wireless amplifier×1,Bodypack transmiter×1,The clip mic×1,Headset×1 ...