SPECIFICATION: Frequency range (region dependant) Digital wireless audio transmission 48KHz audio sampling mode Pre-set 16 selectable frequencies Digital ID code, completely solves frequency interference IR sync downloading the frequency from receiver Lithium battery power supply(The battery is not included) Portable plug-on receiver, plug in the mixer or active speaker directly Up to 40m line-of-sight operating range Suitable for saxophone stage performances, street performances, etc. RECEIVER: 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 continuosly using Dimensions: 185*20*10mm TRANSMITTER: 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 continuosly using Dimension: 125*40*20mm