Item name: Wireless Unit                            
Can be automatically paired N wireless active speakers, only through a bluetooth connection, HIFI sound quality.
Support wired and wireless microphone input, support audio input, USB input,            
Transmission distance: 100-200 meters, 
Frequency Response:20Hz-20KHz
 T.H.D:<0.2%                                          
*Power Supply:100-220V AC ,DC9V           
Signal to Noise Ratio:>85db
Power supply:DC-12V/1000mA
Frequency Range:700MHz-800MHz
Size:215*130*45mm                                            
Support speaker quantiy:1-Npcs                    
Weight: 0.5 KG

N active speakers can be connected as follows,more detail please send me email .