Sell wireless headphone

wireless headphone
Specifications
Transmitter
Working frequency:72--74MHz
Power supply: DC 9V
Transmit distance:>=30m
Transmit distance:max500mV
Input impedance:10K(Ohms)
Receiver
Working frequency:71--76MHz
Power supply: DC 3V
Load:32(Ohms)
Signal/noise ratio:>=50dB
HP-WH2970 Integrated frequency response:50Hz-18KHz