... , geo fencing, vioce monitoring 3. sos panic botton, cellphone tr two way car alarm GPS-100 Berif Introduction It's a GSM ... 's exact whereabouts. 4. Battery Tamper Warning When power to the vehicle unit is interfered with in any way, a proactive warning is ... via GSM network base station and Switch Tower address. 6. Cell phone access Three authorised users can request position, speed and ...