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 click5. Perfect for Running, Walking, Strolling, Cycling, Hiking, Camping, Party, Raves, Holidays, Festivals and Concerts,Roller Skates Accessories6.This product uses batteries .When using, unplug the insulating sheetSpecification:Product name: LED luminous armbandSpecifications: main body 18.5*3.5*1cm, elastic band 12-17cm, width 2cmMaterial: Silicone+PVC+ABSLight mode: always on/flashing/offApplicable 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.Package Includes:1 x LED armbandNote:1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement.2. Do not forcefully open the black battery case. If you want to change the batteries, please be sure to follow the replacement instructions in the pictures.