Weather resistant Nickel plated split ring keeps keys secure Push button on/off switch Glow & flash modes Battery run time: Glow mode: 20 hours Flash mode: 25 hours Long life, replaceable batteries included Battery Type: 2-2016 Lithium batteries included Available with White LED shining through either Lime or Clear/ White Plastic Dimensions: 4.04" x 1.36" x 0.84" 102.62mm x 34.55mm x 21.47mm