FastEngle LED Shoelaces Light Up Shoe Laces with 3 Modes in 7 Colors Flash Lighting the Night for Party Hip-hop Dancing Cycling Hiking Powered by CR-2032 Watch Battery (included), last for about 60 to 80 hours in "flash" mode and about 30 hours in "constant light" mode. 3-Mode Functions: constant light, slow flash, fast flash. Awesome and Eyes-catching! Suitable for any type of lace-up shoes such as skate shoes, roller skates, roller blades, ice skates and more. Stay safe and visible during outdoor training. Great for the parties, night jogging, safety and all kinds of night time fun! LED + High articulation plastic fiber.