Matrix Array 12 Key Membrane Switch KeypadProduct Details:Matrix Array Membrane Switch Keypad ~ 2″ x 2.5″Mounting Holes Center to Center: About 1.8″ (W) x 2.35″ (H)Keyboard has 12 Buttons Arranged in a 3 Column x 4 Row GridButtons are Numbers of 0 – 9 Plus the Letters H and PThis is an 8 Pin, 2.54mm Pin Header on the Back of th KeypadUNKSS-3546