Using two model cr2032 battery, (the products are including battery),LED and Magnetic Working Light with Keychain,Water-resistant But do not put into water. Soft-grip pocket light, super-bright LEDCompact design provides floodlight quality, yet fits in your pocket. Strong Magnet to attach to car or work place; Use Keychain to hang on the anyway to provide brightness. there are Three types of mode(Full light , Half light, Flashing) , You can press the switch to acheiveProduct is the new COB bulb, brightness is very highProducts carry mountaineering clasp, it is very convenient to carry. Behind the product comes with the magnet, can adsorption body. Package weight: 0.059 kgProduct size (L x W x H): 6. 70 x 3. 40 x 2. 50 cm / 2. 64 x 1. 34 x 0. 98 inchesPackage size (L x W x H): 10.00 x 5.00 x 4.00 cm / 3. 94 x 1. 97 x 1. 57 inchesPackage Contents: 1 x Key Chain Light