1.interphoneT-850 2,high battery capacity 3,Lock missing or low voltage alarm 4,built in CTCSS/DCS 5,have more clear voice 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 ...