TYT Tytera MD-390 DMR Digital Radio Waterproof Dustproof IP67 Walkie Talkie Transceiver,  Black Remote kill/stun/activate Emergency call Zone selection Programming password DTMF decoding and encoding Frequency stability +/-1.0ppm Adjacent channel Power -60dB Free time slot power TDMA: 57dBm Hum and Noise -40dB @ 12.5KHZ