The Waveshare RPi Relay Board with Extended Fittings - Raspberry Pi RoHS is an extension board designed specifically for the Raspberry Pi. This board allows the user to directly control a relay from the Raspberry Pi, or use it with optionally available H-bridge driver. The board is designed with extended fittings for optimal cooling and flexibility, making it easier to install on multiple projects. The board is RoHS certified, meaning it is compliant with all environmental standards. This board also comes with a wide range of features, such as support for both single and dual power control, integrated power reset capabilities, and automatic control of the relay when the power is off. Additionally, the board is designed to work with both 5V and 12V power systems and comes with a built-in LED status indicator.