Work Principle: Sound Sensor / Voice Induction Lamp: Lamp will light up continuously around 1 minute after connect with power, then turn-off automatically, please wait around 15 seconds for sensing mode starts. Feature: Auto PIR motion detection Or Sound Sensor for light on/off Durable and energy-saving High sensitivity, high light and low consumption Suitable for corridor, pathway, stair, garden, yard, etc Specification: Light Colour: White Connector type: E27 Detection range: 5M Detection angle: About 120 Power: 3W/5W/7W/9W/12W (Sound Sensor) Voltage: AC200V-240V Operation instruction: 1.Bulb can be installed near stair, better to let bulb head turn to exit/entrance 2.The bulb should be keep far away from heater, air condition, fridge, stove, such places which temperature is high and sensitive (over absolute zero degree object will probably make bulb light up) 3.Do not put any shield, furniture, or big object around the bulb 4.Do not turn it to the window for avoiding hot air /white light perturbance, and body motion to wrongly light up the bulb 5.Do not install bulb near gate or airway Trouble Removal: 1.When install it, it will auto light up and off, occasionally it can auto light up, the reason may be there's animal moving or bulb turns to hot place, or install angle is not correct 2.If it auto light up every 8s and light off every 30s and it repeats that, now you should check whether there's person or animal moving around it, or can take the bulb to another room for checking.