Main Features:1, Voice annunciation(Chinese/English)2, Built-in CTCSS/DCS3, Lock missing or low voltage alarm4, Accord to America army standard that testing support by MIL-810C.D.E rainwater humidity, dust and vibration impact.5, Frequency range:400-470 MHz6, Radio-frequency output power: 7W7, Large capacity battery 1800mAh8, Channel number: ..