Light up anyone's birthday with more than candles thanks to our Flashing Happy Birthday LED Blinkies! These Happy Birthday pins make great party favors and will let the birthday boy or girl know everyone is sending them plenty of birthday love on their big day! Each of these light up Happy Birthday blinkies has 4 LEDs, 1 red, 1 green, 1 yellow, and 1 blue, for maximum visibility on that special day. Use the butterfly connector on the back of the Happy Birthday pins to attach them practically anywhere and let the birthday fun begin! Please note the butterfly connectors may create small holes in the garments they are attached to. These light up Happy Birthday blinkies come with CR927 batteries included and installed and the batteries can be replaced. Our Flashing Happy Birthday LED Blinkies are sold by the dozen and come individually packaged in a clam shell. Quantity-12 Color-Multi-Color Imprintable-No Replacement batteries are available for this item: 2 pcs, CR927