ITEM NAME:3x4 Matrix number Keyboard 12Keypad USE Keys PIC AVR I2O8 3x4 Matrix number Keyboard 12Keypad USE Keys PIC AVR I2O8 3x4 Matrix 12 Keyboard Keypad USE Keys PIC AVR Stamp Product Name : Membrane Switch;Key Type : 3x4 Pad Size : 69 x 51 x 10mm/2.7"" x 2"" x 0.4""(L*W*T);Mounting Hole Diameter : 2mm/0.08"" Mounting Hole Center Distance : 59 x 46mm/2.3"" x 1.8""(L*W);Material : Plastic, Electric Parts Color : Black;Net Weight : 17g Package Content : 1 x Membrane Switch MR-MINI-3x4KEY is a 3x4 matrix keyboard module. It has 8 pins and 10 number on the interface. 7-PIN MRconnect hole. +3.0V to +5VDC supply voltage. Note:Light shooting and differnent displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is ±1-3 cm.