Description: Because of its compact size, it is easy to carry, and it also not cause a burden during riding. It has strong waterproof performance and can be used in rainy days. Needless to say, our product is easy to install due to the adjustable installation strap design, which it suitable for 99 percent of bicycles and mountain bikes. Using USB charging method, the built-in battery can be charged quickly, and the battery life is long. It is made from ABS, is durable to use. There is one size of the product to choose from. Our product is suitable for bike. Item Name: Rear Cycling Light Material: ABS Features: Charging Fast, Pocket Size, Install Easily Color: Black Battery Capacity: 150 Ma Three Modes: First Mode: High Bright Intensity, Second Mode: Fast Flashing, Third Mode: Clockwise Jumping Flash Waterproof: Life Waterproof Using Time: About 5 Hours Size Details: Lamp Diameter: 3.4cm/1.34"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Rear Cycling Light 1 X Base 1 X USB Charging Cable 1 X Strap