Uses passive infrared technology to detect motionTime delay the time out occurs when motion is no longer detected by the sensor and the device counts a set amount of time before turning off the loadIf the device sensor detects motion during this 'time delay' the count resets and the device initiates a new countThe time delay can be adjusted to 30 sec, 10, 20 and 30 min respectivelyZero crossing circuitry relay uses a zero crossing circuitry to provide reliable, long life operationLED- a red LED blinks when motion is detectedFresnel lens detects small motion when mounted within 6 ft of occupantsWhen mounted at a height of 8 ft, the coverage will be approximately 10 ft diameter but sensitivity may be diminishedThe field of view below shows maximum coverage