Transmit: 136-174/350-390/400-520MHz     Aviation frequency band: 108-136MHz     Receive: 76-108/136-180/230-250/350-400/400-520/800-870MHz     Number of channels: 199     Channel spacing: 25KHz (broadband), 12.5KHz (narrowband)     Frequency stability: ±2.5ppm     Working voltage: 7.4VDC±20%     Working temperature: -20Celsius-+60Celsius     Antenna impedance: 50Q     Weight: 280g (including battery antenna)     Waterproof grade IP68     launch part     Broadband     High power transmission     Modulation mode 16K in F3E     Adjacent channel power greater than equal 65dB     Signal-to-noise ratio less than equal -40dB     Spurious and harmonics less than equal 65dB     Spurious emission less than equal -36dBm     Audio response 300Hz-3KHz     Audio distortion less than equal 5%     narrow     High Power     Modulation mode 8K in F3E     Adjacent channel power greater than equal 60dB     Signal-to-noise ratio less than equal -40dB     Spurious and harmonics less than equal 60dB     Spurious emission less than equal -36dBm     Audio response 300Hz-3KHz     Audio distortion less than equal 5%     receiving part     Broadband     Sensitivity -120dBm     Intermodulation greater than equal 60dB     Adjacent channel selectivity greater than equal 60dB     False signal response greater than equal 60dB     Audio response 300Hz-3KHz     Signal-to-noise ratio greater than equal 60dB     Audio distortion less than equal 5%     Audio output power 1W     Colour:black/ArmyGreen     Material:PC     Size:138 x 62 x 40mm          Package Contents:     1 set x walkie-talkie          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.