Instantly increase your visibility, safety, and cool factor while riding your bike in low-light or at night with the Nite Ize SpokeLit LED Wheel Light, fueled by an efficient and clean LED light. The fun Disc-O LED will automatically cycle through the spectrum of colors creating a bright ring of light when you turn it on or press twice to set it to red flashing mode for high visibility Easy to attach with no tools required. Just press this LED bike light onto the spokes of your bicycle wheel and slide towards the rim until the fit is tight. It stays securely in place even during off-road riding. Fits almost all 3-spoke cross pattern wheels on all sizes of bikes, from kids to adults. Included 3V lithium batteries are easily replaceable. Battery run time: 20 hours in Glow mode, and 25 hours in Flash mode. The SpokeLit LED Bike Light is water and shock resistant, giving you an all-weather visibility light, you can count on.