Main technical performances Frequency range: 220-240MHz; 350-370MHz; 370-390 MHz; 400-420MHz; 450-470MHz Channels capacity: 64 Sensitivity: Better than 0. 25uv(12dB SINAD) Channel spacing: 25 KHz/12. 5KHz RF Output power: 25W/5W Audio distortion: Less than or equal 3% Working current in receiving status: Less than or equal 400mA Working current in transmission status: Less than or equal 3A(5W), 8A(25W) DC power source: +9V--+15V, typical value +13. 8V Operational temperature range: -20C--+60C Weight: 1. 0 Kg _ Special functions A. CTCSS noise reduction selective calling function: It can set different CTCSS codes in the same channel with the setting software of this unit so that it can only make a call between the groups with same CTCSS code in the same channel, and it cannot make a call between the groups with different CTCSS codes B. Channel selection function: It can screen unused channel through the setting software of this unit. T C. Secret alarming channel function: Press volume adjust button(^) and channel switch button at the same time, this radio station will automatically switch to secret alarming channel, but at this time the channel number of radio station is not changed, and it is still the original number. D. Field strength indication of receiving signal: After this radio station receives a signal (noise reduction turned on), the green lamp in first bi-color indicator is on. When the signal field strength is about 20dB SINAD, the green lamp in second bi-color indicator is on.