Enhance your PDK R1 One Door Controller's capabilities with this red expansion board designed to extend input/output functionality. The R1E expansion module seamlessly integrates with your existing controller system, providing additional I/O ports for more comprehensive access control solutions. This board is specifically engineered to work with the PDK R1 single door controller, offering expanded connectivity options for your security infrastructure. Perfect for installations requiring additional inputs and outputs beyond the base controller's specifications. The red board design makes it easily identifiable in your installation setup, while its purpose-built architecture ensures reliable performance for door control applications. Ideal for security professionals and installers looking to extend their access control system's capabilities.