Using these lights is a breeze. First, take them out of the package and remove the corrosion protection film before the first use. Then, twist the light to turn it on. They run on 2 x CR2032 batteries which are included and can be replaced easily when they run out. You can place them in vases, fish tanks, or use them for tabletop decoration at your weddings, events, birthdays, or parties. Since they are waterproof, you don't have to worry about them getting wet. To keep them in good condition, make sure to store them in a dry place when not in use. Also, when replacing the batteries, handle them carefully to avoid any damage to the light.