Diateklity LED Bike Tail Light - USB Rechargable and Four Modes - Premium Waterproof Warning Light with 5 LED Bulbs - Easy Intallation BRIGHTER & SAFER--Five LED bulbs have 15 lumens,make the light brighter which is a premium safe guard when you cycling in dark wild.What's more, Diateklity tail light has ultra wide angle range which can improve the sides visibility and improve your safety. FOUR MODES--This Bicycle Tail Light has 4 modes: Steady-on(4hrs run time), Slow flash (10hrs run time), Sudden flash (12hrs run time), Strobe (8hrs run time).Different modes can suit for different situations. EASY TO USE--Use the rubber band to clip on to the back of your mountain bike or helmet firmly as a warning light.This light contain two different size rubber band that can fit for 0.47-1.34 inch diameter of the bike bracket. USB RECHARGEABLE REAR BICYCLE LIGHT --The Diateklity bicycle tail light can charge from your computer or any device with a USB port. Only takes 2 hours to fully charge.No need to change the battery anymore and the light would be more durable! WATERPROOF--Basic on its waterproof IP65 grade,you can use it in rainy days when you are hiking,cycling and traveling.