RECEIVER
Frequency range: 660-690MHz (region dependent) 
Frequency: Pre-set 16 selectable channels 
Modulation mode:  pi/4 DQPSK
Latency: <6ms
Sampling: 48KHz
Frequency response: 60Hz - 15KHz ± 2dB
Total Harmonic Distortion: <0.8%(1KHz)
Signal/noise ratio: >92dB  
Receiving sensitivity: -92dBm
Output: 6.35mm plug
Power supply: 3.7V Lithium battery
Power consumption:  >6 hours continuously using
Dimensions: 185*20*10mm

TRANSMITTER
Frequency range:660-690MHz (region dependent) 
Modulation mode: pi/4 DQPSK
Transmitter power: 10mW
Sensitivity: -47 db±2dB
Frequency change: IR synch 
Microphone type: Condenser
Microphone dimension: Φ14*5.0mm   
Power supply: 3.7V lithium battery
Power consumption:>6 hours continuously using
Dimension: 125*40*20mm    
Package Dimension: 280 x 140 x 65mm