To activate your Multicolor Flashing Heart Earrings, press the button on back. 1 function only: Flashing NOTE: Item is sold PER PAIR. When you buy “1 Piece,” you will receive a pair of earrings. LED Colors: 1 Blue, 1 Yellow, 1 Red Dimensions (W x H): 1.63″ x 1.5″ Come ready to wear with batteries installed. Batteries are NOT replaceable.