Battery-Powered & Energy-Efficient: Each cork string light is powered by 3 x LR44 batteries (included), eliminating the need for plugging in. The silver wire is waterproof (battery compartment is not). Continuous lighting lasts approximately 12 hours; expect less with 24+ hour use. Easy to Use & Install: Each cork features an on/off switch for simple operation. Our bottle lights easily insert into the top of wine bottles – no drilling required. Simply light them up and enjoy the enchanting fairy lights. A Romantic Way to Repurpose Bottles: 20 super-bright LEDs on a 2m long, thin wire. Low heat emission and eco-friendly design. These beautiful bottle cork lights create a romantic, peaceful, and warm ambiance. Enjoy DIY Fun for Many Occasions: Made with high-quality ultra-thin silver wire (better than standard copper wire), this battery-operated wine bottle light is easily shaped to your liking. Perfect for parties, weddings, barbecues, Halloween, Christmas, gardens, indoor and outdoor decoration, and more. A great gift for children, friends, and family. Note: Remove the insulating film before use. Use a screwdriver to open the battery compartment before replacing batteries. Only the wire is waterproof; the cork is not, so keep it away from water. These lights are a creative decorative addition, not intended as a primary light source.