To activate your Blinkies, first pull out the paper tab, then twist the circular battery house clockwise. To deactivate, twist counterclockwise. Height: 1.06 in. – Width: 1.5 in. – LED Colors: 1 Red, 1 Jade, 1 Amber – Batteries: Includes 2 replaceable CR927 Batteries. – Weight: 0.02 LB