Since it is designed with 4 modes, it allows you to switch as needed. Featuring high brightness LED lamp bead design, it ensures excellent lighting effect. USB charging design makes it convenient to charge. And the intelligent lighting sensor design is very power-saving. Good aluminum and ABS material makes this bike light very durable. The length of this product is 80mm and width is 41mm. It is suitable for outdoor riding. Item Name: Bicycle Light Material: Aluminum, ABS Lamp Beads: 5W Battery Life: About 4 Hours Product Brightness: 350 Lumens Battery Capacity: 1200mAh (Battery Included) Charging Method: USB Charging Features: High Brightness, with Horn, Smart Lighting Sensing Size Details: LxW: 80mm x 41mm/3.15" x 1.61"(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 Bicycle Light 1 x Buckle Base 1 x Data Cable 1 x Wired Horn