HIGH VISIBILITY IN DARK--Our led wristbands are plenty bright when you turn them on, that will enhance visibility especially in dark situation. The 360-degree ultra-high visibility design is designed to make you more noticeable and safer when walking, jogging or cycling at dusk and at night RECHARGEABLE--Our light up arm bands go with rechargeable battery, so you only need to charge regularly instead of changing the battery frequently. 1 hour of charge can guarantee over 6 hours long-last working time, user-friendly, more practical and conomical UNIVERSAL FIT--The size of this reflective running gears are 35.5cm x 3.7cm, so it's perfect for everyone like runners, bikers and walkers. Very simple to use, you can easily slap running safety lights on your wrist, arm, and ankle LIGHTWEIGHT & COMFORTABLE--It is very ligh. The inside of the running light armband is is made of a very comfortable and smooth fabric, so direct contact with the skin will not cause you any uncomfortable feelings. It can be held firmly in place, and doesn't move up and down when you running or walking 3 DIFFERENT MODES--The led running lights are designed with three light modes, fast flash, slow flash and solid bright, you can adjust different modes according to different environments to make you more secure. The waterproof design allows you to use it with confidence even in the rain.