The GSM SMS Controller alarm s are special for remote switch on/off machine, equipments, and also it supports digital inputs for different detectors like water level detectors, PIR motion detectors and so on. One of the advantages of them is when the inputs recovery can alert by SMS, and with one interlock Relay output, one SMS Command switch on/off relay output. When alarm occurrence, will send definition SMS text and dial the user mobile phones. GSM Frequency: 850/900/1800/1900Mhz; 1 Independent Output Relay (240VAC3A) can be switched ON/OFF by sending a SMS text; 1 Alarm-Link Output Relay (240VAC3A) can be switch on 0-120minutes if controller unit triggered; 8 Alarm logic digital inputs, NC or NO and EOL is optional; 3 SMS Alert numbers and 5 Alarm dial Telephone numbers can accept to the alarm message; Supports armed, disarmed, inquiry status, switch on/off Output Relay by SMS Commands; Password protected, prevents unauthorized user; Can be set up and programmed from PC Configurator by USB cable; Time stamped alarm messages. Backup rechargeable battery inside, can work for 24hours when AC Power goes off. Can be operated from anywhere, no distance limit; Based on GSM Network, applied to many applications. Specification: Material: Metal Size: 105x88x30mm/4.13x3.46x1.18in Note: Our configuration software is WINDOWS and XP compatible. WINDOWS is recommended Package Includes: 1x Host 1x Adapter 1x Terminal 1x Antenna 1x User Manual CD Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item.