Welcome to our store!1. Reduce wind resistance, enhance riding pleasure, and make it easier for backpackers to store. 2. Easy to install and remove, without any difficult requirements even if you use it for the first time. 3. Durable and waterproof and has a variety of light modes to meet your different needs. 4. Built-in lithium battery, supports USB charging. A good and wise choice you should make. 5. It is small in size, light in weight, easy to carry and does not affect your riding.Item Type: Bicycle TaillightMaterial: ABS + SiliconeWeight: Approx. 76 g / 2.7 ozBattery Capacity: 260 MABattery Type: Lithium battery (built-in battery included)Charging Method: USB chargingWaterproof Rating: Life WaterproofLight Mode:Red light: High Light-Medium Light-Low Light-Flashing-Jumping Flash-Fast FlashingWhite light: High Light-Medium Light-Low Light-Flashing-Jumping Flash-Fast Flashing2 x Bicycle Light1 x Data Cable2 x BandageGuaranteed Satisfaction: Customers are our top priority. If you find any problem with the product, please contact the seller immediately. We strive to provide satisfactory after-sales service.