RETEVIS RT83 10W 400-470MHz 1024CHS Waterproof DMR Digital Dual Time Two Way Radio Walkie Talkie, GPS Version 1. Using TDMA technology, combined with Tier II, AMBE++ vocoder design, compatible with DMR two-way radios such as mototrbo 2. The color display allows users to check the operating status at a glance, including battery power and caller identity, etc. 3. IP67 waterproof and dustproof function, so you can use them anywhere without worrying about the surrounding environment 4. Function: GPS, highlow power optional, digital encryption, emergency alert, VOX, scan, message, etc. 5. Frequency range: 400-470MHz 6. Channel capacity: 1024 channels 7. Channel spacing: 12.5KHz 8. Working voltage: 7.4V 9. Battery capacity: 2800mAh (lithium ion) 10. Antenna impedance: 50 ohms 11. Size: 148x56x39mm Transmitter: 1. Output power: 10W 4W 2. Frequency stability: +-1.0ppm 3. Adjacent channel power: less than or equal to -60dbm 4. Idle time slot power: TDMA: less than or equal to -57dBm 5. FM modulation mode: 12.5KHz: 11K0F3E 6. Modulation deviation: 2.5KHz: @ 12.5KHz 7. Passive time slot power: -57dBm 8. Modulation: BER is less than or equal to 5% 9. Vocoder type: AMBE ++ Receiver: 1. Common channel reflection: greater than or equal to -12dB 2. Adjacent channel selectivity: TIA603C: 65dB, ETSI: 60dB 3. Spurious response: TIA603C: 75dB, ETSI: 70dB 4. Audio power: 1W 5. Audio response: 1db--3db 6. Rated audio distortion: less than or equal to 3%