1.radio tetra T-550 2,manufacturer/OEM 3,Lock missing or low voltage alarm 4,built in CTCSS/DCS 5,High capacity Li-ion Main Features:1,Voice annunciation(Chinese/English)2, Built-in CTCSS/DCS,3, 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 ...