Hexie series GPS/GSM alarm adopt fission style design(alarm mainframe+gps/gsm mainframe),because alarm mainframe and gsm/gps mainframe have been installed separately,so it safe factor is higher,different product have different functions , and compatible with all cars with 12 V voltage (including the car within alarm system original),parts of edition possess double group engine power off, ask for help and vibrate test functions Different customers need differents edition and network frequency band,so we offer germany siemens factory-grade module GSMTC351 or MC55 or MC56 or france factory-grade module wavecom Q2686. GPS position receive adopt SIRF the three generation chip group,all product set 700mA back-up power ,gsm/gps mainframe working voltage scope 8v-32v: working quiescent currentú+80mA,alarm mainframe working voltage 9v-15v. Alarm method :user phone,user phone sms,center sms alarm ,sound/light/mute alarm Alarm content:car operation ,open door,brake ,vibrate ,battery power-off,ask for help,slop over,speed alarm ect.