The be quiet! Dark Base Pro 901 is a full tower case designed for users building high-performance systems with a focus on flexibility and silence. Its spacious interior supports a wide range of motherboards, from Mini-ITX up to E-ATX and XL-ATX, and provides ample room for large components, accommodating CPU coolers up to 190mm in height and graphics cards up to 495mm when the HDD cage is removed. To help you balance cooling and noise, the case includes interchangeable top and front panels, allowing you to switch between a mesh design for maximum airflow and a solid aluminum finish for a quieter environment. Construction combines aluminum for the top and front covers with a tempered glass side window and a sturdy steel frame. The I/O panel is particularly modern, featuring touch-sensitive buttons and a built-in 15W Qi wireless charger for your devices, alongside a USB 3.2 Gen 2 Type C port. For cooling, it comes equipped with three Silent Wings 4 140mm PWM high-speed fans and offers mounting points for up to 11 fans in total, including support for radiators up to 420mm in the front. This chassis is well-suited for enthusiasts who need significant storage and expansion options, as it can house up to 16 2.5-inch and 7 3.5-inch drives. The inclusion of an inverted layout option means you can flip the internal components to suit your desk placement, while the integrated ARGB lighting adds a subtle glow to the build. With its 82.69-liter volume and substantial 17.8 kg weight, it provides a stable and professional foundation for a workstation or a high-end gaming PC.