Fangrui Product Details 1. Sx88 1 Tx + 2 Rx Smart Noise Reduction Lavalier Wireless Microphone 2. Input Voltage: 5v 3. Microphone Battery Capacity: 70mah 4. Charging Compartment Battery Capacity: 300mah 5. Battery Life: 6h 6. Signal-to-noise Ratio: 64dbm 7. Sensitivity: -42db 8. Frequency Response Range: 20-20khz 9. Transmission Distance: 15-30m 10. Transmission Delay: 30ms 11. Supports Long-distance High-definition Sound Reception For Live Broadcast, Video Vlog Shooting, Interview Sound Reception, Video Teaching And Other Occasions 12. Supports Automatic Noise Reduction, Reverberation, Monitoring, External Speaker, Mute, And Can Charge The Phone While Live Broadcasting 13. Wireless Couplet, Automatic Connection When Powered On, Simple Operation, Supports Double Use 14. Applicable To Mobile Phones, Computers And Other Devices Without App 15. Convenient Storage And Portable When Going Out Easy To Clean And Maintain