Mainly Features of the GSM SMS Controller-Alarm S150: ¡ô 1 relay output (240VAC@3A) can be switched ON/OFF by sending a SMS text; ¡ô 1 relay output (240VAC@3A) can be switch on 4minutes if any inputs triggered; ¡ô 8 Alarm logic inputs, NC or NO and EOL is optional; ¡ô 3 SMS Alert numbers and 5 auto-dial numbers can accept to the alarm message; ¡ô Two-way voice communication by external microphone and speaker; ¡ô Supports armed, disarmed, inquiry status, switch on or off relay output by SMS Commands; ¡ô Password protected, prevents unauthorized user; ¡ô Can be set up and programmed from PC Programmer by USB cable; ¡ô Time stamped alarm messages; ¡ô Backup rechargeable battery inside, can work for 24hours when power off; ¡ô Can be operated from anywhere, no distance limit; ¡ô Based on GSM Network, applied to many applications.