Tinkerforge Master Brick 3.1 is equipped with four 7 pole Bricklet connectors that can be directly controlled over the USB-C™ interface. When building a stack the lowermost Master Brick acts as the master of the stack and routes all communication between the stack boards and controlling device. Additionally, the master Brick 3.1 can be used with Ethernet- and WiFi Master extensions. Master Brick 3.1 can be used for communication purposes and individual requirements such as temperature or humidity sensors, USB actors, relays, etc.