... of two-way car alarm system. It combines the GSM mobile communication, MGPS locating technology andMICROCHIP rolling code technology, ... fastening wireTechnical Specification1. Mainframe Working Voltage: 12V Static Current (+GSM Module): 40mA -60 mA Arm/Disarm Working Frequency: 315MHZ ... Door: 0V Key: 12VFoot Brake: 12V 4. GSM Module Frequency Range: GSM 900MHZ/1800MHZ Voltage of Serial Interface: 2.8V ...