◊ PACK OF 20 UNITS:The size of battery case is 2*0.87 inches, it’s very easy to hide into your design works.This decorative lights mainly made of flexible silver coated copper wires, each string is 6.6ft with 20 micro Led beads,which provide sparkling beautiful effect. ◊ ENJOY DIY FUN: With flexible and extra thin but sturdily built copper wires, the led string fairy lights can be easily bend, twist and mould into any shapes that you desire.Perfect for your Valentine’s day gift decoration, home party, make cool jellyfish costume for your kids, or any other unique lighting projects you desire. ◊ SAFE HIGH-QUALITY & WATERPROOF:High Quality Low power & heat insulated copper wire make it not overheat after usage.The string with LEDs is IP67 waterproof rating and it could be immersed into water, ideal for indoor and outdoor use. The battery box is not waterproof，please place it properly. ◊ BATTERY OPERATED:2x CR2032 batteries included, which support 24 hours continuous working and longer if using with breaks. The small battery pack is with on/off slide switch，convenient to operate the string fairy light and enjoy it.Please NOTE, the short fairy lights would run out of battery after 24 hours continuous working, batteries need to be replaced when the lights get dim. ◊ BEST SERVICE FOR YOU：if you meet any problem, please feel free to Contact us via Amazon message box or contact the seller directly.