... as friendly human voice instruction, Led indicator, Anti-hijacking, Override switch, Sensitivity of shock sensor adjustable, Power off alarming, Shocking ... so the own can know if the alarm is triggered by the Intruder or burglar. Can Checking system status by telephone, ... Size of mainframe: 134mm*120mm*34mm G.W.: 2.5Kg GSM car/ auto Alarm with In-car telephone and remote control with SMS and calling