To activate your LED Faux Diamond Pierced Earrings Multicolor push the earring through your earlobe’s pre-pierced hole and firmly attach the other half on back, light will turn on and stay on. Steady light function only. NOTE: Item sold in pairs. 1 piece = 1 pair. LED Color: Multicolor Dimensions (L x H): 0.8″ x 0.375″ Comes ready to use with 2 replaceable AG0 Batteries. To replace batteries, carefully unscrew the back of the battery housing. The batteries are very small, so keep a close eye on them.