This Portable meeting amplifier with radio mike has a 30 watt output and a range of about 50 metres. It can be mains or rechargeable battery operated (Takes a sealed 12V lead-acid type) and the lapel microphone connects to the belt clip radio transmitter. (This requires a 9V PP3 battery). The amplifier can also be used for straightforward stereo amplification with the included lead. The unit comes with a Targus presenter to enable remote operation of a computer during the presentation and a laptop style carry case. Further details can be found at -