Wireless magnetic door detector & universal transmitter
The JA-81M is a component of Jablotron’s Oasis 80 alarm system. It is designed to detect the opening of doors, windows etc. It can also be extended by a normally closed / normally open sensor.
It is also designed to detect the handling of roller blinds. This is achieved by detecting ratchet-wheel movements. Small movements are filtered out so that wind blasts do not cause false alarms.
The battery-powered detector communicates via OASIS radio protocol.