Secure stainless steel carabiner light attaches to keys, zippers, jackets, backpacks, sleeping bags, tents, dog collars, and more. Long-lasting LED (light emitting diode) provides an ambient glow bright enough for everything from reading fine print to finding your car door keyhole. Glow mode (press once) is a bright LED area light, flash mode (press twice) is for safety and signaling. Water-resistant. Dimensions: 1.25 In. W. x 2 In. H. x 0.75 In. D. Weighs 6 Oz. Requires (2) CR2016 3V replaceable batteries, included.