Fangrui Product Details 1. One For Two Outdoor Wireless Microphone Audio Headset Amplifier Loudspeaker 2. Working Voltage: Dc3.5v-5.5v 3. Current: 75ma (max) 4. Charging Time: 4 Hours 5. Use Time: About 8 Hours 6. Carrier Frequency: 600-900mhz 7. Rf Power: 10dbm 8. Transmission Distance: 80m (open And Unobstructed) 9. Receiving Sensitivity: -88dbm 10. Sampling Frequency: 48kss 11. Signal-to-noise Ratio: 65db (f=1khz, P=1pa A Curve) Input Voltage: Dc-5v 12. Ergonomic Design, High-sensitivity Pickup Head 13. The Sound Effect Is Clear And Loud, Comfortable To Wear 14. Easy To Disassemble, The Headset Can Be Used As A Handheld Microphone After Disassembly 15. Anti-fool Pointing, 90-degree Anti-fool Microphone Is More Humanized Design 16. Long-distance Receiver, Strong Anti-interference, Stable Signal, 50-80 Meters Receiving Range 17. Built-in 600mah Lithium Battery, Long Battery Life 18. Support 15 Groups Of Frequency Points, Multi-group Use Without Cross-frequency 19. Compatible With Mic Interface Devices, Plug And Play, Equipped With 6.35mm And 3.5mm Adapters 20. Metal Hose, Free To Bend, Easy To Adjust The Direction In Real Time 21. Dimensions: 68x28x23.3mm