KEEP PROTENTIAL DANGER AWAY - Powered with small button battery, this LED Slap band provides ultra-high visibility in dusk and nighttime activities. Keep you safe at night when do outdoor activitis, such as running, jogging, cycling & hiking. UPGRADED RECHARGEABLE DESIGN - Except the ensure the led armband works well, running reflectors improve the battery in rechargeable design. 2 hours charging, 3-5 hours working. Practicable, User-friendly and save money. LIGHTWEIGHT & EASY WEAR - Only 25g. The armband is lightweight to be used for wearer of all ages. Velco design for easy use. It would not give you any burden even in long time wear. Happy wearing, feel nothing. ADJUSTABLE - The Slap band has a adjustable size from 11"-13", by simply slap wrap it will fit on both adult and children for the wrist, ankle, and arm. To apply on the biceps, please consider the dimension to see if it fits on. PARAMETER - Color: Blue; Weight:25g; Package: 2 Pack; Full charging time: About 1-2 hours; Each time using: 2-5 hours; Size fit: 11"-13".No storage bag Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!