No Battery Require, a solar panel on the top, 100% Solar Powered. The best choice for environmentalists, generally charge in the sun 5-6h will light up 6-8h, slide the switch to the "ON" position, long lasting LED bulbs, little heat.Warm White More Romantic. Enough copper wires length to decorate any you want. All copper wires are bendable and flexible too, you can make any shape you like or warp on bottle easily.Fits for wine bottles, glass bottles, soda bottles, beer bottles and many other kinds of bottles, the cork bottom: 1 in (26 mm) in diameter and the cork top: 3?5 in (15 mm) in diameter.The wire lights are waterproof, so it will be absolutely safe if you want some water in the bottle.(The cork is not wateproof.). Very suitable for garden decor, deck decor, patio decor, fence decor