The DSC PG9984P is a Dual Band motion detector that will detect movement on the PIR spectrum and includes K-band microwave detection as well as a backup so that you get the best in detection without the normal false alarms that you might experience with a regular PIR motion detector.  

This motion detector also uses temperature compensation technology that will adjust the sensitivity settings automatically so that it can tell the actual human body temperature from the surrounding area where it is located. That means that if the room temperature closely matches that of the human body; the detector will still be able to distinguish. The PG9984P also features the handy LED indicator light that will allow for optimum placement without having to check back at your keypad.

Features

- Visible link quality indicator on the device
- Vandal-resistant design
- Dual Technology PIR and K-Band Microwave frequency to reduce false alarms
- Anti-disguise mode to prevent intentional circumvention of the detector

Specifications

Dimensions: 4.5" x 2.3" x 1.1" 
Battery Life: for 5 years ( typical use )
Battery Type: 3V CR123A Lithium Battery
Weight: 90g ( 3oz )
Operating Temperature: 14°F to 131°F