the sensor is an active motion detector. The module emits high-frequency electro-magnetic wave (5.8GHz) and receives their echo. The sensor detects the change from even the slightest movement in its detection zone. A microprocessor then triggers a "switch light ON" command. Detection is possible through doors, panes of glass, or thin walls.
Note: The high-frequency output of this sensor is <0.2mW that is just one 5000th of the transmission power of a mobile phone or the output of a microwave oven.
APDS9960 Proximity, Light, RGB
This breakout is chock full o' sensors! Add basic gesture sensing, RGB color sensing, proximity sensing, or ambient light sensing to your project with the Adafruit APDS..