1. No need to replace the battery, and no need to recharge frequently. It comes with 1 Micro-USB so it can charge the front and back at the same time.2. There are 3 modes: fast flashing - slow flashing - always on-off.3. Front and rear light bars and reflective bars provide 360 reflection and visibility to help you stand out in the dark.4. Very easy to put on and , just slide it over your head arm.5. The battery is IP44 waterproof, so you don't have to worry about damaging the battery even if you use it in the rain.Color: fluorescent greenMaterial: Nylonsize: 80 x 5cmPackage Contents:1 x LED Reflective BeltOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 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. Sold by-YJL official store