... , gas sensor and Light control, SOS function Economic Touch Keypad LED Wireless Alarm GSM Home Security System with Auto-Phone ... and Listen-in function Brief Description: 1.LED displays, Touch keypad ,Upgrade design and Easy operation2.Support 8 kinds of - ... battery power.10. 5-ways of arm/disarm: SMS, remote controller, built-in keypad, wireless keypad (optional device), phone call. 11. One-key arm ...