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. Using touch control design, you can switch the light mode with a light touch. It can also intelligently detect the light, increase the brightness during the day and reduce the brightness at night to turn it into a driving warning light. It is made from PC, is durable to use. The length of the product is 6. 5 cm, the width is 4. 2 cm. Our product is suitable for bike. Item Name: Rear Cycling LightMaterial: PCFeatures: Charging Fast, Pocket Size, Install EasilyBattery: 250mah Lithium BatteryWaterproof: IP 44 WaterproofCharging Method: USB ChargingCharging Time: about 40 MinutesFlashing Mode: Long Bright, Gradually Brighter And Gradually Darker, Slow Flash, Fast FlashSize Details: 6. 5cm x 4. 2cm/2. 56" x 1. 65" (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 Light1 x USB Charging Cable