【6 MODES & 220° FLOOD ANGLE GUARD YOUR SAFETY】There are 6 light modes for you to choose from: (1) High constant light (2) Low constant light (3) Low brightness flashing (4) Hight brightness flashing (5) Customization (6) Standby. The high-powered output will increase your visibility to the vehicles surrounding you in the dark, up to 2km viewing distance meaning our bike tail light is not only visible from the rear, but on both sides. 

【IPX7 WATERPROOF & UP TO 50H LONG BATTERY LIFE】Our bicycle taillight up to IPX7 waterproof level can suitable for rainy or cold weather, and Maximum 50h runtime make long-distance riding worry-free. It's more than a bike rear spotlight, which also serves as a helmet backlight, backpack light, dog walking light, scooter light, wheelchair light, and wherever you need it.

【EASY TO INSTALL & REMOVE】Our Bike tail lights fit any size bike seat cushion or bicycle seat tube. We provide a saddle mounting bracket and an adjustable silicone strap to mount on the saddle rail or the seat post, without extra tools needed, unscrew from the mounting bracket easily for recharging.

【POWERFUL BIKE TAILLIGHT BUILT FOR CONVENIENCE】Built-in Lithium battery comes with a magnetic cable that charges from your computer, wall charger, power bank, or any other device with a USB port. After charging for about 2 hours, the tail light can work for 10—50 hours in different modes.