... is a easy operating burglar alarm system with wireless sensors ,it use wireless frequency to work, only need one local SIM ... when entering the system setting.SIGNAL:Wireless signal indicator, it shall be on when effective wireless signals are available or under ... Technicals: Input Voltage:DC12V /1AStandby Current:<35mA Alarm Current:<450mA Wireless Frequency315MHz or 433.92 Mhz optional;,2262 / 4.7MΩ ...