Base type: B22,Bulb interface type: E27.It will auto light up when you enter into the detection range(within 5M), and auto turn off after delay time(according as your adjustment) if you had left the induction area. It can identify day and night automatically. 2 optional adjustment modes by twist the Lux button : only light up at night or both night and daylight. It utilize the infrared energy from human as control-signal source. it is easy to install and used widely.