The OKY2237-2 is a shield, expansion board that can be used with an ARDUINO NANO from OKYSTAR. It is a board that provides an expansion port for connecting other equipment, and it is capable of connecting the ARDUINO NANO to the I2C bus. It features fourteen I/O connectors, a USB port, six solder pads, and a voltage regulator. It provides users with multiple functions that help design and implement their projects. The shield can be easily installed and is designed to be used in combination with the ARDUINO NANO. It also features power protection, USB power input, and a current and voltage monitoring system, making sure your projects are protected and run smoothly.