Fangrui Product Details 1. U-620 Professional 1 To 2 Waistpack Wireless Headset Microphone System 2. Frequency Range: 530.0mhz~989.0mhz 3. Transmitting Power: Less Than 10mw 4. Dynamic Range: Greater Than 100db 5. Comprehensive Distortion: Less Than 0. 6. Frequency Response: 30-18khz 7. Receiving Sensitivity: Less Than -105dbm-+12db Sinad 8. Power Supply Voltage: Dc9v-13.5v 9. Frequency Range: 640-695mhz 10. Dynamic Range: Greater Than 90db 11. Comprehensive Distortion: Less Than 0. 12. Delay: Less Than 3ms 13. Audio Signal-to-noise Ratio: Greater Than 85db 14. Frequency Response: 30-18khz 15. Receiving Sensitivity: Less Than -105dbm 16. Receiving Distance: 50-100 Meters 17. Working Voltage: Aa1.5v Battery X2 =3v 18. Working Current: 100-120ma 19. Frequency Range: 640-695mhz 20. Frequency Error: Less Than 15ppm 21. Emission Rate: 11-15dbm 22. Frequency Response: 30-18khz 23. Uhf High Frequency Band Fm, Infrared Frequency Matching 24. One-to-two Fm, 2x100 Channels 25. High-definition Lcd Display, Fiberglass Surface, High-end Clarity 26. Brushed Metal Panel, Receiver And Handheld Transmitter Use Durable Metal Shell, Durable And Scratch-resistant 27. Standard 1u Chassis, Convenient For Engineering Installation And Debugging 28. Ideal Use Distance Of About 50-100 Meters 29. Dual Antenna Reception, With 1 6.5 Output And 2 Caron Balanced Outputs, Suitable For Connecting Various External Devices 30. Less Transmission Delay, Long Transmission Distance, Fully Integrated Chip Solution, Stable Product Performance 31. It Has A Wide Range Of Applications And Is Used In Home Theaters, Ktv Rooms, Conferences, High-end Clubs, School Teaching, Hall Performances, Meeting Rooms Of Enterprises And Institutions, And Many Other Places.