PRODUCT DETAILSLED handlebar lights for eye-catching side visibilityFit over grips 26mm - 32mm in diameterStretchy rubber attachment allows for secure easy installationWeather resistantPush button switchGlow and flash modesAvailable in 2 packs of red or color-changing Disc-O LEDsBattery run time:Glow mode: 20 hoursFlash mode: 25 hoursEasily replaceable 2 x 2016 3V lithium batteries included