XUEMEI Description Features: 1. Adjustable for any size: The elastic bands make easy to adjust for a loose or snug fit. 2. Super bright, comfortable,soft,easy to use, user friendly. 3. Our arm light is design to fit both men and women, comfortable to wear on the leg or ankle, arm. 4. Change the light between steady mode and flashing light with just 1 click 5. Perfect for Running, Walking, Strolling, Cycling, Hiking, Camping, Party, Raves, Holidays, Festivals and Concerts,Roller Skates Accessories 6.This product uses batteries . When using, unplug the insulating sheet Specification: Product name: LED luminous armband Specifications: main body elastic band 12-17cm, width 2cm Material: Silicone+PVC+ABS Light mode: always on/flashing/off Applicable scenarios: outdoor sports, cycling, running, etc. Interchangeable batteriesPowered by two pieces of CRV2032 lithium button cells, the wristband can work for about 60-80 hours. Please allow 1-3cm deviation due to manual measurement. 2. Do not forcefully open the black battery case. Delivery Quantity: 1pcs Product color: orange Product size: 40*2CM