GSM Home security alarm with Eight wireless LED defense zone, four wired defense zone. Home Security Alarm SystemMain Features: 1. ... in total. 11.Send the SMS to GSM alarm system to program, it is very easy and quick ... to be installed and operated 12. With inner back-up battery, when the power is ... , it still can work about 12 hours.13. With output relay, can control the home appliance, like ...