Features: The 50 key Keyboard Card delivers 50 programmable buttons to minimizes pin usage, optimizing circuit design for complex input tasks. Built from durability ABS plastic and equipped with an AVR MEGA8A microcontroller for stable operating it supports I2C or serialed port for seamlessly device integration in a compact form. Ideal for engineers, developers, and enthusiasts creating embedded systems or customizable control . Perfect for applications in industrial panels, and space constrained projects requiring reliabled, programmable input. Enjoy effortless customization of key functions and robust performances, making this embedded keyboard a versatile addition to technical setups. Specifications: Component: ABS Item：CardKB V1.1 small 50-Key Keyboard Unit Supports AVR MEGA8A Mocrocontroller Supports I2C or serialed port Size: 84x54mm Weight: 50g For electronics projects and prototype development, embedded controllers and automation and education and learning tools. Package Includes: 1PC Card Keyboard V1.1 unit 50 keys 1PC 20cm connecting cable note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.