Adopts good sensitivity detector, integrated circuit. It can identify day and night automatically. Light Sensor: 3LUX~2000LUX adjustable, Can work in day and night. Time Delay: 3sec to 7min adjustable, Time-Delay is added continually, when it receives the second induction signals after the first induction, it will compute time once more on the basic of the first time-delay rest. Detection Range: 6m at bellow 24 Degree Celsius, can be adjusted accordingly, item fits for large room. consumption, ecofriendly. Gathers automatism, convenient safe, saving-energy and practical functions. Utilizes the infrared energy from human as control-signal source, it can start the load at once when one enters detection field. It can identify day and night automatically. It is easy to install and used widely.