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All of the radio were set up to the same frequency,they can work with each other just on the same channel when out of the box..If you are outside and you want to change the frequency,it also allowed to set the radio manually by the keyboard. Function: Wide/Narrow Band(25kHz/12.5kHz) Voice companding Monitor function Busy lockout function Scanning function Time-out Timer (TOT) function LCD display Battery voltage display function Channel name display and editing functions Keypad lock function Emergency alarm function Low battery alarm Power saving function Chinese and English voice prompt Basic Descriptions Rated Voltage: 7.4V DC±10% Output power: Battery type: Li-ion battery Battery capacity: 1400mAh Specification Frequency stability: ±2.5ppm Carier wave tolerance: 5ppm Modulation character: 6 dB per fold frequency patch Emission current: < 1.6A CTCSS / DCS:0.5±0.1kHz(Wide) 0.3±0.1kHz(Narrow) Inter modulation: 8-12mv High/Low TX power selectable Adjacent channel selectivity(wide/narrow):