Features of cb radio S820: 1. 16 channels. 2. PC programming. 3. Output power 5W/1W. 4. 50 groups CTCSS, 136 groups DQT. 5. High/Mid/Low power selectable. 6. VOX function 7. wide/narrow bandwidth selectable(25KHZ/12.5KHZ) . 8. Wireclone function. 9. high capacity lithium battery. 10. Channel steps(5K/6.25k/10K/12.5K/25K) 11. Frequency range: 136-174MHz/ 220-250MHz/350-390MHz/400-470MHz. S820 Index Normal specifications Frequency range 136-174MHz 220-250MHz 350-390MHz 400-470MHz Channel Capacity 16 CH Channel spacing 25 / 12.5 KHZ Frequency step 5 , 6.25KHZ Filter for first mid-frequency 21.4MHZ Filter for second mid-frequency 455KHZ Operating voltage DC:7.2V Battery S-90 lithium ion battery 1300mAH about 12 hours according to 5-5-90 Operating temperature -30 To 60 Frequency stability ± 2.5ppm Antenna impedance 50 Ω Dimension 52 X 28 X 100mm (exclude antenna) Weight 215g include battery and antenna Transmitter Receiver Frequency error ≤ 5 X 10 -6 reference sensitivity ≤ 0.25uV( SINAD 12dB) RF power output ≤ 5W Common-channel restraint ≥ -8dB Modulation limit ≤ 5KHz Adjacent-channel selectivity ≥ 55dB Adjacent channel power ≥ 65dB Spurious response interference ≥ 55dB Spurious RF sponderance ≤ 7.5 μ W Intermodulation interference ≥ 55dB Modulation characteristic Pre-emphasis of each frequency-interval is 6dB (300Hz-3000Hz) Audio response De-emphasis of each frequency-interval is 6dB (300Hz-3000Hz) Used bandwidth ≤ 16 KHz Jam-up ≥ 85dB Audio distortion ≤ 5% Audio distortion ≤ 5%