Features1Easy to install and operate, convenient and practical, to improve the safety of night riding. 2Made of high quality plastic material, sturdy, durable and long service life. 3Waterproof protection design, walking in the rain is not a problem, give daily waterproof. 4USB direct charging, can be charged at any time, builtin 500mAh polymer lithium battery, can meet the daily needs, fast USB charging. 5Multifunctional extension clip, clips on clothes, clips on the backpack, can expand a variety of application scenarios, night running, bike sharing, walking, work, etc.SpecificationItem Type: Bicycle TaillightsMaterial: PlasticWeight: Approx.45g/1.6ozBattery: Lithium Battery 500mAh (with Battery)Lighting Mode: 100% Constant, 50% Constant, Fast Flash, Backward Flash, Slow Flash, Forward Flash, Bounce Flash, Windmill FlashHow to Use:Can Prevent Rain Splashing, but Can Not Be Immersed in Water for a Long Time.Package List1 x Bicycle Taillights1 x USB Cable1 x Bandage1 x Manual