GX2140 GSM BATTERY- OPERATED ALARM DEVICES GX2140 is a Battery-only Operated GSM SMS 4 input alarm device. It has 4 inputs which allows you to monitor various sensors / switches / dry contact relays / burglar and fire alarm panels. It will send SMS text messages and optionally call up to 3 numbers. Usecases: Simple alarm system for places with no external power usage Rat-trap monitoring Letter-box monitoring Security call for public areas like parks, gardens Caravans / yachts / boats / warehouses Water Flooding / Water Loss / Tank Level Alarms Transformer theft Read more