gsm Home security alarm GSM auto-dial alarm system with: 1. Adopt GSM communicator, no distance limit to alarm. 2. Support GSM/CDMA mobile ... (no longer than 16 character each number). If an alarm occurs, numbers will be dialed in order. 4. Remotely ... security reasons . 6. Supports all kinds of wireless/ wired sensors (NC contacts), such as PIR detectors, door (gap) sensors, gas sensors, smoke sensors, ...