Saful GSM-500 home security Alarm System (GSM alarm system)Function Introduction: 1 ... in wireless transmitting module, could be coding with wireless siren and appliance.10. 1 group of timely Arm and ... a telephone.18. One-key-control function: Out Arm, Home Arm, Remote Arm.19. Real-time, delay, 24 ... -type of arm: Remote control arm, out arm, home arm, timed arm, arm by phone.24. Built-in ...