Features: 2.20.000 call groups. 3.250 text messages. 4.4000 channels (250CH/Zone, 16 Zone) 5. Built in GPS. 6. True 2 time slots allow for two call paths on one frequency. 7. Dual frequency, dual display, dual standby. 8. AMBE vacoder, with crystal clear sound quality. 9. With an ultra small size and a power output of up to 20W, it is easy to install on any device. 10. Customizable keys ensure quick and easy operation. General Product Code RT73 Frequency range UHF: 400-480MHz Very high frequency: 136-174MHz Number of channels 4000 (250 channels/area) Channel spacing 12.5KHz/25KHZ Standby current 160mA Working temperature range -20 & 8451;~+50 & 8451; Antenna impedance 50 Ω Dimensions 121.5 * 65.5 * 42.5mm Rated voltage DC-13.8V transmitter RF power 5-20W Modulation limit ± 2.5dB@12.5kHz / ± 5.0dB@25kHz FM buzz and noise -40dB@12.5kHz / -45dB@25kHz Conducted/radiated emission -36dBm 1GHz/-30dBm 1GHz Neighborhood selectivity -60dB@12.5kHz / -65dB@25kHz Audio response+1~-3dB Audio distortion of 3% Emission current 3A Recipient Frequency stability+/-1.5ppm Simulate sensitivity of 0.3 μ V/0.25 μ V Digital sensitivity (5% BER) 0.25 μ V/0.2 μ V Intermodulation 65dB Neighborhood selectivity 60dB@12.5kHz / 65dB@25kHz Stray suppression 65dB Rated audio 500mw FM buzzing sound -40dB@12.5kHz / -45dB@25kHz Audio response+1~-3dB Receiving current 350-460mA The package includes: 1 x Mini Mobile Radio 1 x Handheld microphone 1x GPS antenna 1x power cord 1x bracket 1x screw 1x Explanation