Overview: Easily straps onto bikes One keychain feature a bright white LED emitter, & the other a red LED emitter Works as a bike safety light when attached on bikes, & as a keychain flashlight when used standalone Each keychain features 3 modes: Fast Strobe gt; Slow Strobe gt; Steady On Each powered by 1 x CR2032 battery (included) Specifications: Dimensions: 3.54 in x 1.34 in x 0.59 in Weight: 1.69