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HANDY LIGHT FOR YOUR KEYS OR PET'S COLLAR - This push button light attaches easily to your keychain or pet's collar using the integrated stainless steel carabiner, for instant visibility in the dark REPLACEABLE LONG-LIFE BATTERIES - Included lithium 2016 batteries last up to 20 hours and can be easily replaced for use over and over again AVAILABLE IN MULTIPLE COLORS - These unique lights come in a variety of colors as well as a color-changing Disc-O LED option so you can use them to identify multiple pets in the dark