Since it is designed with 5 modes, it allows you to switch as needed. Featuring high brightness LED lamp bead design, it ensures excellent lighting effect. Life waterproof design makes it not easy to damage by rain so as to has a long service life. Designed with intelligent light-sensing function, this lamp can automatically adjust the brightness of the light according to different ambient brightness. It is made of good aluminum alloy and PP material, very durable. USB rechargeable design makes it very convenient to use. It is suitable for outdoor riding. Item Name: Bicycle Light Material: Aluminum Alloy, PP Battery: 5200mAh (Included) Brightness: 1600 Lumens Featurtes: High Brightness, Smart Light-sensing, Waterproof, Double Lamp Head, 5 Modes Size Details: LxWxH: 10.2cm x 5.2cm x 2.8cm/4.02" x 2.05" x 1.1"(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 USB Cable 4 x Spacers 1 x Bracket 1 x User Manual