The JLS-LL-IWS02 series passive infrared (PIR) sensor detects human motion by sensing heat signatures against the background. When motion is detected, the sensor switch turns on the load, keeping it on during occupancy. After no motion is detected for a set time period, the load automatically turns off. The IWS02 includes one relay and an ambient light level sensor for hold-off functionality, which ensures the lighting load remains off when the light level exceeds the threshold setting.