Flammi LED Shoelaces Light Up Shoe Laces with 3 Modes in 5 Colors Flash Lighting the Night for Party Hip-hop Dancing Cycling Hiking Total 2 batteries are included, last for about 70 hours in "flash" mode and about 30 hours in "constant light" mode 3-Mode Functions: constant light,slow flash,fast flash Great for any type of lace-up shoes such as skate shoes, roller skates, roller blades, ice skates and more. Certificated by CE ROHS Stay safe and visible during outdoor training