PLL frequency synthesis technique for stable signal transmission 

UHF frequency range with 6 selectable channels 

Low power consumption design,receiver can work for more than 24hrs by using 2pcs alkaline batteries 

One transmitter can be operated with multiple receivers within the operating range 

Dynamic expanding circuit for high S/N ratio 

Complex interference-free circuit for using more than 4 sets simultaneously without mutual interference 

Both transmitter and receiver use LCD-display to indicate frequency,channel,battery,level status

Long operating range up to 100m