Samgo LED Flashing Lighting Flash Nylon Shoelace Luminous Noctilucent Light up Shoe Laces Gift (Red) size: total length of 107cm laces Suitable for any kinds of Shoes, including running shoes, boots and skates. 3-Mode Function - Solid, Slow Blink, Fast Blink 2 x CR2032 button cells each string for longer service time: constant lighting for 30 hours; flash model for 60-80 hours This product is suitable for: skating sports, outdoor sports, night running, a large festive party, concert, promotion, cheer, holiday promotions, birthday gifts, creative new exotic products!