Compatibility - Supports Raspberry Pi 5; 1U Rackmount design is compatible with 19 Inch Server Rack. PCIe Expansion Support - Includes a motherboard that enables PCIe expansion, allowing the connection of M.2 NVMe SSDs in various form factors (2230/2242/2260/2280). 2C Interface - The board routes the Raspberry Pi's 5V, GND, SDA, and SCL pins to the rear through PogoPin connectors, offering I2C interface peripherals in a Grove format. Programmable LED Indicator - A red LED on the board serves as a programmable device ID signal, controllable via the GPIO4 pin to indicate the status or identity of the device. Modular Design - Supports the integration of up to five Raspberry Pi devices, with the option to replace one slot with an OLED display frame. OLED Display Integration - The option to include a 0.91-inch OLED screen that communicates with the Raspberry Pi via I2C, displaying customizable information such as CPU usage, memory status, IP address, and serial numbers. NOTE -