Fangrui Product Details 1. Retevis Rt83 10w 400-470mhz 1024chs Waterproof Dmr Digital Dual Time Two Way Radio Walkie Talkie 2. Using Tdma Technology, Combined With Tier Ii, Ambe++ Vocoder Design, Compatible With Dmr Two-way Radios Such As Mototrbo 3. The Color Display Allows Users To Check The Operating Status At A Glance, Including Battery Power And Caller Identity, Etc. 4. Ip67 Waterproof And Dustproof Function, So You Can Use Them Anywhere Without Worrying About The Surrounding Environment 5. Function: Highlow Power Optional, Digital Encryption, Alert, Vox, Scan, Message, Etc. 6. Frequency Range: 400-470mhz 7. Channel Capacity: 1024 Channels 8. Channel Spacing: 12.5khz 9. Working Voltage: 7.4v 10. Battery Capacity: 2800mah (lithium Ion) 11. Antenna Impedance: 50 Ohms 12. Size: 148x56x39mm 13. Transmitter: 14. Output Power: 10w 4w 15. Frequency Stability: +-1.0ppm 16. Adjacent Channel Power: Less Than Or Equal To -60dbm 17. Idle Time Slot Power: Tdma: Less Than Or Equal To -57dbm 18. Fm Modulation Mode: 12.5khz: 11k0f3e 19. Modulation Deviation: 2.5khz: @ 12.5khz 20. Passive Time Slot Power: -57dbm 21. Modulation: Ber Is Less Than Or Equal To 22. Vocoder Type: Ambe ++ 23. Receiver: 24. Common Channel Reflection: Greater Than Or Equal To -12db 25. Adjacent Channel Selectivity: Tia603c: 65db, Etsi: 60db 26. Spurious Response: Tia603c: 75db, Etsi: 70db 27. Audio Power: 1w 28. Audio Response: 1db--3db 29. Rated Audio Distortion: Less Than Or Equal To