Detector unit with auxilliary battery

Details Detector unit with auxilliary battery Detector unit with auxilliary battery

G - Physics

08

B

325/44, 323/5

G08B 1/08 (2006.01) G08B 29/18 (2006.01) H02J 7/35 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1311274

ABSTRACT OF DISCLOSURE A detector unit for use in detecting unauthorised intrusion into homes, offices, factories and other buildings is described. The detector unit comprises a detector such as a passive infrared detector and a radio frequency transmitter that is connected to the detector and that transmits a detector signal when the detector is actuated, and battery means. Two batteries power the detector and the transmitter. A power control means is arranged so that when the power of the said first battery drops below a certain minimum the second battery is connected to the detector and the transmitter. A warning is given at the main control unit that the second battery is being used so that the user can now replace both batteries.

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