The RS485 CAN Shield with Extended Fittings -Raspberry Pi RoHS manufactured by Waveshare is an electronic part used to add two communication ports to the Raspberry Pi board. It supports both CAN and RS485 protocols, which allows for two-way communication between two different devices or components. Additionally, the shield utilizes extended fittings to provide more consistent communication and increased protection from electrical interference. It is RoHS compliant, and comes with two mini terminal blocks, two terminal blocks for Grove I/O, two mini power cables, a CAN cable, and a jumper. The shield is a great tool for device networking and communication, and provides a reliable, easy-to-use solution for transmitting data.