... say it''s an advanced ,hi-technology and good quality system. How it works?Main features,Tracking functions,- Dual Tracking ... , SMA - Remote control, Working frequency, 315Hz/433MHz. Code, 1527/2240 study code Working Voltage, 12V (27A 12V dry battery) Control Distance ... 7V - Mainframe Dimension, 125x108x26mm 2-way GSM/GPS/GPRS Car Alarm with Remote Starter, Air Conditional, Foot-break and Real-time ...