This Braille Pocket Keychain Learning Tool is a bright little keychain that's fun to use. With three square disks that rotate, this turn and click mechanism allows you to make a variety of braille characters. Small and sturdy, three square plastic disks rotate left or right for endless characters. The portable keychain tool can go with you anywhere. Bright yellow with black dots. 1 1/4 inches long by approx. 3/4 inches wide. Perfect to fit in your pocket!