gsm Home security alarm GSM auto-dial alarm system with: 1. Adopt GSM communicator, no distance limit to alarm. 2. Support GSM/CDMA mobile phone. 3. Can ... 4. Remotely arm, disarm, panic alarm and two-way intercom. 5. Control the system by a mobile phone anywhere, anytime ... . But need to input a PIN code for security reasons . 6. Supports all kinds of wireless ...