Light Up LED Shoelaces for Night Fun Runs is a cool addition to your night run outfit be it a 5K requiring a light costume or a normal evening jog that requires staying visible and safe. LED Shoelaces are fun for all ages and miles beyond any other unique shoelace you could get. To activate your Light Up Shoelaces remove pull tab and press button on top of the round battery house. Choose from 3 light functions: Fast Flash Slow Flash and Steady Lights. NOTE: Sold per pair. 1 pc = 1 pair. Battery House Dimensions (L x W x H): 1.5in. x 1.25in. x 0.5in. Shoe Lace Length: 47in. Shoe Lace Color: White. LED Color: Blue. Blue LED Shoelaces for Night Fun Runs come ready to use with 2 replaceable CR2032 Batteries. To change batteries pop off the top of battery house switch em out and snap the top back on.