SincereetaliSize?: cuff length?: Adjustable range 32CM 27CM-33CM: width 2.5CM Material: reflective mesh webbing + matching LED electronics High visibility day and night - This luminous LED bracelet combines LED light strips with waterproof reflective materials, which is ideal for signaling on the road during the day, dusk, night or rainy days Rechargeable version - no need to replace disposable batteries, this flash bracelet has a micro USB port and can be charged anywhere < li>Thanks to the adjustable buckle and Velcro closure, they fit perfectly on the wrist, bicep, calf and even the bun, and are not reserved for children or adults. This product is suitable for: outdoor sports, night running, large-scale festivals, concerts, promotions, cheering, employee benefits, large-scale corporate events, etc.