DFRobot DFR0827 PiTray Mini is a model B like carrier board for building cluster with Raspberry Pi Computed Module 4 (CM4). This PiTray mini provides a neat and budget solution for CM4 applications with advantages over Raspberry Pi 4B in industrial applications. The DFR0827 PiTray mini acts as a good starter kit for CM4. The CM4 provides models without wifi and Bluetooth® chip. This PiTray mini does not include DSI, CSI sockets, audio jack, dual micro HDMI, or USB3.0 hub to fit CM4 on a business card size carrier.