Velleman is a Belgian electronics manufacturer that produces a wide range of electronic components and modules, including microcontrollers, sensors, and other devices for professional applications. Velleman also offers a wide range of home automation products under the Velbus brand. These products include dimmers, sensors, and relays that can be used to automate and control various functions in a home, such as lighting, heating, and security. They use a slightly modified CANbus protocol called Velbus, to communicate between devices. The Velbus protocol is a simple, low-cost and open protocol, it's widely used in building automation and smart home applications, and it's supported by a large number of third-party devices, controllers and software.