... prompt for main panel operation7. Built-in intelligent English message8. Alarm system can be used as a telephone9. Arm, disarm, monitor ... settings can be finished by keypadTechnical specifications:Input Voltage: DC9V~12VStandby Current: <55mAWarning Current: <450mAWireless Frequency: 315/433/868MHz, 2262/4.7MΩ & ... controls,1 power supply,1 manual NEW GSM Security Alarm System with Voice and Intercom