M3 Wireless microphone

Features:
1. Frequency:: 650MHz-690MHz
2. Frequency response:30Hz-18KHz
3. Modulation mode : FM
4.Transmission power: 110mW
5.Signal to noise ratio: 96dB
6.Sensitivity of reception: -96dB
7.The distortion degree of: <0.1%
8.Charging time: 5-7hours 5V(500mA-2000mA)
9.Dynamic range: 96dB