mini-itx This is an unused, opened item. Size: Ultra-small size (9 x 7.4 x 3.5 inches), designed to accommodate both Mini-ITX motherboards and Flex type power supplies (5.9 x 3.2 x 1.6 inches). Cooling System: Designed to solve common cooling problems in mini PC cases with abundant ventilation holes, including the front panel. Expansion Design: One PCIE slot, two holes for WiFi, one USB 3.0 port, one Type-C (10g) port, and HD audio support. CPU Cooler: Height of 63mm or less when installing an M.2 hard disk, 54mm or less when installing a 2.5-inch SSD on top, and 38mm or less when installing a 3.5-inch HDD on top. Portability: Small volume (3.8L) allows for easy placement in a backpack, suitcase, or on a desktop.