Our GSM door contact alarm system is a standalone alarm system. It is ideal for smaller rooms in properties. By utilizing GSM technology, the device sends a text message and/or a call to the user's mobile or landline phone when the door contact is breached. This way, the occupant of the room is immediately notified if the room has been broken into. The device is housed in a perfectly weatherproof casing, allowing it to be installed both outdoors and indoors. Additionally, the device has been tested at both high temperatures and frost.