No need AAA batteries, save cost. Built-in rechargeable battery operated (1000mAh high capacity), providing much longer lighting time than old version which use AAA batteries, recharged by USB devices 5V (like USB adapter, power bank, laptop) with the included charging cable. Aluminum alloy shell with built-in magnet inside, easy to install this strip light without tools in 2 ways.WAY 1: Free attach to any ironwork surface without using double-sided tape and metal strip, such as fridge, barbecue; All non-hardware surfaces, clean with double-sided tape and metal strip (included) that will attach the lights. Portable, free swap places per your desires. PIR functionality Motion Sensing and Dusk to Dawn.Human Motion Activate,AUTO Light On/Off,can apply to all applications for your home lighting.A perfect smart security light for cabinet, hallway, porch, wine rack, bathroom, passage you need lights. How does it work?? There is a three-position switch: Switch to "G": Automatically turn on only when human motion is detected in the dark or at night, auto light turns off after 20 seconds if no more motion detected at new. during the day, switch to "On": always on, also could be used as flashlight or emergency, switch to "Off", no lights; 6000-6500K daylight , 10 LED bulbs, providing up to 100 lumen illuminations (brighter than those using AAA battery) Sold by Briday Store