Specifications: Made of premium materials, it is safe, practical and durable to use. It is suitable for outdoor sports, night running, mountaineering camping, festivals, concerts, promotions, cheering, employee benefits, company activities, etc. There are multiple colors for selection which are bright and it can act as a reflective warning when there is no electricity and cannot emit light. What a great gift for your parents who loves running and your kids who are riding a bicycle, which can assured their safety. Item Name: Luminous Running Armband Material: Nylon Webbing, LED Electronics, Magic Tape Power Method: B: 2 x CR2032 Button Battery (Included), Glowing Time: 40 Hours A: LR2032 Rechargeable Battery (Included), Charging Time: 0.5 Hour, Glowing Time: 2-3 Hours Flashing Mode: Long Light, Fast Flashing, Slow Flashing (Controlled by Switch) Features: Adjustable, USB Rechargeable, Lightweight Luminous Front Side Length: 28cm-32cm/11.02"-12.6" (Approx.) Armband Size: 32cm x 2.5cm x 2cm/12.6" x 0.98" x 0.79" (Approx.) Notes: 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. Package Includes: 1 x Luminous Armband