The surface or corner mount DS840T TriTech PIR/Microwave Detector provides a microwave frequency of 10.525 GHz, a coverage pattern of 40 ft. x 40 ft. (13 m x 13 m), and a normally closed tamper switch with contacts rated at 28 VDC, 0.125 A maximum.

The DS840 is a microprocessor-based TriTech Passive Infrared/Microwave Intrusion Detectors which provide immunity to false alarms caused by pets (a dog up to 60 pounds or up to 5 cats, and other small animals such as birds or rodents). Patented Passive Infrared and Microwave signal processing provide excellent catch performance with freedom from false alarms.

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