Xcellent Global USB Rechargeable Bicycle Tail Light Bike Rear Helmet Head LED Light 100 Lumens LD100R ULTRA-BRIGHT TO KEEP YOU SAFE: The bicycle tail light produces an extraordinarily wide-beamed 100 Lumens red light which is eye-catching from all angles. Equip your bike with this tail light to enhance maximum visibility on the road KEEP YOUR MOUNTING OPTIONS OPEN: It can be strapped on bike handlebar,seat post,your helmet,backpack,stroller and your pet's collar in seconds.The quick release hanlebar mount fits for 12-34mm diameter. Be creative and strap it anywhere 6 MODES: 3 Steady modes consist of standard, high and over drive mode. And 3 flashing modes consist of 50% flashing, 100% flashing and strobe mode. With simple one button operation, you can easily choose the mode you like USB RECHARGEABLE: Charges from your computer or any device with a USB port. High quality rechargeable lithium battery(3.7V 500mAh) takes only 2 hours for a single full charge and automatic fully charged cut-off system keeps your light secure. SUPER WATERPROOF PROPERTIES: The bicycle tail light can also be used in rainy days as usual. Water resistant rated to IPX4 - protect against splashing water from any angle, no worries on rainy days