Glowys (TM) LED Blue Safety Armband Jogging Walking Reflective LED Armband 60-80 hours, normal 4-5 months; battery can be replaced. Size: 10.6" IN-12.5" IN (Length can be customized specifications) 100% brand new and high quality The item have three modes:1.Steady On 2.fast flash 3.normal flash This item suitable for for outdoor sports, night running, large-scale festival party, concert, promotion, cheer, employee benefits, corporate events and so on.