To activate simply press the button on the back of the Light Up Round Badge Pin. Set the light up badge on 1 of 3 light settings. Dimensions: Height: 2.0 in. Width: 2.0 in. LED Colors: Pink Light Up Round Badge Pins include 2 AG10 Batteries. Batteries for this product are replaceable. Packaging: Individually wrapped, poly bag - 125 pieces per box- 500 pieces per carton.