Features: This 4x4 Keypad Matrixeslet you quickly add control to your electronics projects. The 16 Button matrixes keyboard modules is made of plastic and metal material which is very durable and reliable. Keyboard matrixes allows you to quickly add control to your electronic project. Direct replacement, a simple plugs and plays with no wire splicing. Its small size and compact design make this button more convenient in modules alarm/safety device operation, access control, and device control. Specifications: Material:ABS Quantity:1,2(optional) Size:Approx.6.5cm/2.55'x6.4cm/2.51' Package Includes: 1x 16 Button Keypad note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.