EASY TO SHAPE: 6.6ft / 2m extra thin string lights with 20 LEDs are made of flexible copper wire, can be easily bent and shaped. The small battery box (2*0.87 inches) is easy to hide in your design works. LOW HEAT: Low power consumption & thermally insulated LED string lights do not overheat during use, are cool to touch and safe to use. BATTERY OPERATED: The string lights are battery operated with an on/off switch, powered by 2 CR2032 batteries (included), the battery can be easily replaced. Please note that the batteries need to be replaced when the lights become dimmer. IP65 WATERPROOF: The LED mini string light is waterproof (the battery box is not). The copper wire part can be immersed in water to create amazing atmospheric effects. Complete sealing allows the firefly lights to be used both indoors and outdoors. WIDE APPLICATION: The copper colored string lights are perfect for birthday party, Halloween, Christmas, wedding or for decorating your bedroom, children's room, dorm, mason jar, transparent umbrella, garland or for designing other unique lighting projects