Outdoor waterproof: The lamp beads are waterproof and can be used outdoors, but because the battery box is not waterproof, just wrap a layer of plastic outside the battery box and you can use it outdoors. Battery operated: powered by 3 AAA batteries (not included), low consumption, very safe and reliable to use. Easy to use: just stick it to the window and press the ON / OFF button on the battery compartment to turn the lights on and off (lighting mode: steady light). Recommended Surfaces: Simply attach the suction cup to smooth surfaces like glass, mirrors, ceramic tile, marble, and stainless steel instead of painted walls, rough textured surfaces, and wallpaper. Uses: Christmas can be used to decorate, whether indoors or outdoors. Used for Christmas decoration, party, yard, bedroom, decoration, shop, photography, etc. They are also fun gifts for your friends and family. It helps to add to the Christmas atmosphere.