LED 3D Heart Necklaces are a lovely delight. With a puffy & prominent heart pendant plus color change lights, there is no better way to show your love, be it for Valentine's Day or a special event. To activate, remove pull tab & press the button on back. With each push of button, choose from many light options: flash, slow change, all lights on steady, red blink, green blink & blue blink. 3 AG3 batteries are included and replaceable.