With the built-in motion sensor, this bulb will light on only when the motion is detected. It saves the energy as the light will be on only when the motion is on. No need to call the electrician for the installation or a complicated wiring. Simply insert it in normal Bayonet (B22) type bulb socket for the instant effect. 7 W only power consumption gives light of conventional bulb at 75 W. Life time of the LED is about 40,000 hours. It will light up and stay on for around 40 seconds when the electricity is on. The light does not come on even with the motion in the day light (100 lux or more). The built-in sensor will pick up the motion upto 4 metres in radius when the bulb was installed 2.5 metre high. The electricity switch should be on all the time, and the waiting power consumption is 0.4 watt. 2 years warranty with the original receipt. The sensor should not be blocked for the best performance.