Body Induction Sensor Led Light refers to a fluorescent lamp that contains mercury in a gas fill inside the bulb which becomes excited when electricity is applied. The gas that emits UV radiation is converted into visible white light by the phosphor coating of the bulb. These are used to detect movement and will automatically turn the nightlight when it detects motion in the dark. These low electricity consumption powered by a rechargeable built-in battery. These LED night lights will last longer in auto mode with one full charge. Body Induction Sensor Led Light are available at a very reasonable price and delivered within the given time frame.