Features: 1. Wireless Live Broadcast Microphone, Live Broadcast/Interview/Record/Online Class 2. Long-Term Battery Life, Large-Capacity Lithium Battery 3. Lossless Sound Quality, 20-Meter Transmission, Long-Lasting Battery Life 4. Automatic Pairing, Plug And Play 5. Intelligent Noise Reduction, Clear Sound Quality Description: 1. Name: Wireless Live Microphone 2. Microphone sensitivity: -38dbm 3. Battery capacity: 70mAh (LIR1254) 4. Normal mode recording sampling rate: 44.1K 5. Shutdown power consumption: 2.6uA 6. Noise reduction mode recording sampling rate: 32K 7. Power consumption: 4mA (start without pairing with the receiver) 8. Transmission power (MAX): 10dbm 9. Power consumption: 10mA (power on and pair with the receiver) 10. Indoor barrier-free linear distance: 15-20m 11. Power consumption: 6mA (in silent mode) 12. Outdoor barrier-free linear distance: about 10m 13. Charging current: 70mA 14. Chip: professional 2.4GHz wireless microphone chip 15. Working power consumption: 16mA (plug in the mobile phone) Specification: B- (PU646B) Color: Black Material: ABS Package Contents: 1 x Transmitter 1 x Receiver 1 x Data Cable 1 x Microphone Cover 1 x Earphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.