Brand N/A Model N/A Quantity 1 Color Blue + red Material FR4 Features Voltage: 5V; Current: 500mA Specification Standard interface that can be expanded in a variety of development boards; With screw holes for easy installation; Touch switch uses high-quality materials beautiful and durable; Buttons have been marked convenient and practical; Applicable to a variety of platforms including Arduino / AVR / ARM Application Great for DIY project English Manual/Spec Yes Other Also known determinant keyboard which is used four I / O line as the line cord four I / O lines as the column lines of the keyboard. Packing List 1 x 4 x 4 Matrix keypad