Function: Protection, intercom, attendance, outdoor ultra-high, low temperature operation warning, GPS positioning, vibration reminder Model number :CH-H99/H88 Output power :2W Frequency range :136-174mhz ,400-480mhz Rated voltage :3.6V Frequency channel:250*2 channels(Dual Standby ) Waterproof :IP54 The radio features : 1. Hidden intercom system ,group call,single call ,release hands 2. Built-in high power speaker ,suitable for all kinds of complex environment 3. Original touch PTT button 4. Noise-canceling microphone ,rejecting noise . 5. Double light flashlight 6. One-button pressing emergency distress signal 7. Original creation RFID attendance system 8. Outdoor ultra high temperature /low temperature operation warning