Only need two CR2032 Batteries Different colors are available On/off flashing function EL Shoelace----Light Up, Your Step!Only need two CR2032 BatteriesDifferent colors are availableOn/off flashing function Battery: 2 CR2032 button batteries, can keep 5 hours flashingControl box: white ellipticSwitch: OFF or ON FlashingPacking: 100pcs/ctn, G.W:17kgs, CBM: 90*46*36cm/ctn