sensors - TechTOnions.com

Type: Passive Infrared (PIR) Motion Sensor
Usage: Detects human movement within sensor range
Features: Small, inexpensive, and low-power
Core Component: Pyroelectric sensor with split detection zones
Operation: Senses changes in infrared radiation levels
Applications: Common in home security systems, appliances, and gadgets
Detection: Responds to movement by differentiating IR levels between two sensor halves

I don't care that they stole my idea . . I care that they don't have any of their own