No need for AAA batteries, saving costs. Built-in rechargeable battery (high capacity 1000mAh), longer lighting time than the old version using AAA battery via 5V USB device (such as USB adapter, power bank, laptop)) and the included charging cable. Aluminum alloy shell, built-in magnet, can easily install this light bar in two ways without using tools. Method 1: Freely stick on any metal surface, without using double-sided tape and strips metal, such as refrigerators, barbecue grills; all non-material surfaces can be cleaned with double-sided tape and metal tape (included) to fix the light. PIR motion detection function and human movement activation from dusk to dawn, automatic lighting on/off, suitable for any home lighting application, perfect smart security lighting, suitable for cabinets, hallways, porches, wine racks, bathrooms and those who need lighting aisle. br> How does it work? ? There is a three-position switch: switch on "G": it will automatically turn on only when human