Sunspeed Waterproof USB Rechargeable LED Bike Tail Light THIS TAILLIGHT PROVIDE SAFE AND RELIABLE VISIBILITY. The high-powered output will increase your visibility to the vehicles surround you in the dark. Super Bright - 40 Lumens on High setting, 15 Lumens on Low setting. Visible 180 degrees, meaning the light is not only visible from the rear, but on both sides. 3 Light modes: Solid, Fast-Strobe, Slow-Strobe. EASY TO INSTALL QUICKLY WITHOUT ANY TOOLS REQUIRED! Anyone can mount this taillight in less than a minute. Fits any sized seat post or bike frame, 3 Strapping Sizes. Elastic Rubber stretchable to fit on almost anything! This light can be strapped on your helmet, your backpack, your bike, your stroller, and even your pet's collar. Be creative and strap it on anywhere. TAIL LIGHT WILL NOT FALL OFF - There are 3 different sizes strapping allowing users to strap on variety of places. The bouncy strap for flexible stretching to keep the tail light secure and firm. WATER & SHOCK PROOF - Built of the sturdiest aircraft quality aluminimum, and with a rubber gasket installed in the casing, so this light can withstand all adverse weather conditions (not recommended for diving). Runs on 2 X CR2023 Batteries ORDER NOW WITH NO RISK - No questions asked lifetime money back guarantee. Your satisfaction is our guarantee! If you aren't 100% satisfied with the bicycle tail light for ANY reason within 30 days of purchase, we will refund the full purchase price. No hassles, no delays, and no questions asked! That's how confident we are that you will love it!