Secvest 2Way radio opening sensor, brown CAT Catalogue Description 3: The radio opening sensor (FU8320B) is a magnetic contact that protects doors and windows. Unauthorised opening is detected and the radio alarm centre is notified. The best installation site for the radio opening detector is the middle of your door or window frame. The sensor can also be attached to the bottom window frame if a certain window with the magnetic contact attached needs to be tilted. The radio opening sensor consists of a sensor and a magnet. They are attached parallel to each other, 3 to 10 mm apart. The sensor is triggered as soon as this distance increases. CAT Catalogue Description 4: High-quality magnetic contact Detects the opening of windows, doors etc. Connecting facility for additional wired sensors Can be used as radio module Can also be taught into wired alarm systems via a radio extension Power supply: 3V Li/MnO2 Battery type: CR2 Power consumption: 0.03A Frequency: 868