A wireless internal PIR sensor / transmitter with a transmitting range of about 60m line-of-sight. This will be reduced a little by obstructions such as walls, but for most properties, this will reach the receiver without any difficulty. It's compatible with any of our GSM or active infra-red range of receivers.
Detection range is 12m, over an angle of 90 degrees. Powered by its own internal 9V battery (supplied)