JA-81M wireless magnetic door detector & universal transmitter

The JA-81M is designed to detect the opening of doors, windows etc. It can also be extended by a normally closed / normally open sensor connected to its wired input.

It is also designed to detect the mishandling of roller blinds. This is achieved by being wired to a device detecting ratchet-wheel movements. Small movements are filtered out so that random wind blasts do not cause false alarms. The battery-powered detector communicates via OASIS radio protocol.