... LED defense zone, four wired defense zone. Home Security Alarm SystemMain Features: 1.Two-way to communication.2. ... or cell phone anytime, wherever you are. For security reasons, a PIN code must be used for access ... all kinds of wireless sensors, such as PIR detectors, door (gap) sensors, gas sensors, smoke sensors, beams, ... in total. 11.Send the SMS to GSM alarm system to program, it is very easy and ...