Planet Bike Spok LED Micro Taillights have superbright LEDs that are visible up to 1 mile.Superbright LED visible up to 1 mileStrap allows light to be mounted to all shapes and sizes of tubesTranslucent case allows for 220 degree visibilityKeychain hole, up to 100 hoursItem SpecificationsWeight28gBattery2 NBulbNew Nichia eXtreme 2.0 LEDRun TimeUp to 100 Hours