RedSun New GPS/SMS/GPRS Tracker TK103B Vehicle Tracking System With Remote Control Remote control with alarm on/off function. GPS/GSM station positioning. SMS/GPRS/internet network data transfer. Point-to-point, point to group, group-to-group monitoring. Support 9-36V, so it can be installed on Bus, taxi, truck ,personal car, business car etc. Absolute street address with GSM network. SD card for data logging. Continuously auto track upon different time and distance intervals Main functions: SOS, Geo-fence, movement alarm, over speed alarm, accident alarm, voice monitoring etc. Remote control with alarm on/off function.