Self contained audio intercom kits which work on the GSM mobilephone network. They allow calls to be made from a door or gate to any telephone anywhere in the world. These kits are available in many variations such as audio only, audio with code lock and audio/code lock with camera.
GSM Datasheet - 843.18 kB
The GSM –CallFree2 is a GSM remote control switch that is activated by calling its mobile phone number. No call costs are incurred as it rejects the call without answering and switches on the device connected to it. CallFree2 can also be connected to PIR’s, burglar alarms, water level or leakage sensors, Carbon Monoxide detectors, etc. and will send a text when an alarm condition is triggered.
GSM – CallFree2 PDF
