SODIAL(R) Fashion For Dog&Cat LED Flash Light Collar Tag Blue This is Pet Dog LED Safety Flashing Blinker Light Tag Collar,A useful tool to find your pet Battery can last about 122hours. Replaceable batteries (included) Waterproof, but try not to submerge it in water Packeting content:1 x Fashion For Dog&Cat LED Flash Light Collar Tag ,3 x LR42 button cells