St. Patrick's Day Flashing LED Light Up Shamrock Necklace Three light functions Both the smooth Acrylic Shamrock and Fabric Lanyard light up. Simply press the buttons for activation. The lanyard has "Happy St. Patrick's Day" imprinted down both sides in black. Shamrock Depth: 1.25 in. , 3.17 cm - Shamrock Height: 4.37 in. , 11.09 cm. - Shamrock Width: 3.50 in. , 8.89 cm. - Lanyard: Length: 28.00 in. , 71.12 cm. - LED Colors: 11 Jade Includes 3 Replaceable AG13 Batteries for each component.