... client station by FM network. Each of these three type devices can achieve the warning function separately.This series device can ... pre-set message warning buttons, 3 MP3 buttons (Pre, Play/Stop, Next)SIM/UIM Standard 3V/1.8V user card interface ... port, 15KV ESD protection; Data bits: 5, 6 ,7, 8; Stop bits: 1, 1.5, 2; Parity: none, even, odd, space ...