Each halloween light string needs take 3 X AA batteries (Notice:batteries not included,the battery case is not waterproof ),never worry about not having a socket nearby.Both the string and light are waterproof Pumpkins, ghosts and bats are a unique combination that adds a cheerful atmosphere to the Halloween party. These cute lights come in different colors, bright and safe, and are perfect for Halloween indoor decoration 3D purple bat combination lamp string is very suitable for indoor bedroom,window,living room or outdoor garden, yard decoration, create a strong Halloween atmosphere, let you enjoy the fun of the festival Product description Halloween Decorations 20 LEDs Purple Bats.Battery Operated String Lights for Halloween Decorations Indoor Package includes: 1 x 3m 20LED Bat string lights Warm notes: The lights are waterproof but the battery packs should be hidden from rain. Easy to use: First placed the batteries, simply turn on/off the switch to power on/off the indoor string lights, then you could enjoy the holiday party lights. Specifications: Material: plastic, LED Color: random Size: as the pictures shown