• Length:1.5 in. • Width: .87 in. • LED Colors: Red, Blue, Green • Batteries: 2 Replaceable CR2016 Batteries It always helps to have a little mini portable flashlight with you wherever you go. This tiny flashlight attaches to your keychain and never gets in the way. Great to have in dark parking lots, camping, hiking and for emergencies. These bright guys are visible over a mile in clear weather. These make great gifts for your friends that love gadgets. This little Black Light Keychain Flashlight has several specialized uses: • Ultra Violet Counterfeit Money Detector • Bodily Fluid Detector • Enhances our Glow in the Dark Body Paints Squeeze the center to power on fast, or flip a tiny switch with your fingernail to keep the light on.