ITEM NAME:2PC 4x4 Matrix Array 16 Key Membrane Switch Keypad Keyboard for Arduino Ras E6H4 2PC 4x4 Matrix Array 16 Key Membrane Switch Keypad Keyboard for Arduino Ras E6H4 Module:4X4 membrane keypad Contact resistance: 500 ohms Insulation resistance: 100M ohms Key Operating Force: 150-200N Rebound time: 1 (ms) Colour: Black,red,blue Material: plastic,Film Size: approx 7*7.7cm Package Contents: 2 x Membrane switch button Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Colour: Black,red,blue. Material: plastic,Film.