Antec ISK 310-150 Mini-ITX Desktop Computer Case with 150 Watt Power Supply, Quiet 80mm Side Fan Pre-Installed, 3 Drive Bays and Mini-ITX Motherboard Support 3 drive bays with an external 5.25" slim optical bay and two internal 2.5" HDD bays. Advanced cooling system with a side 80mm TriCool 3-speed exhaust fan; a number of air vents on sides delivers efficient ventilation with the lowest noise level. Convenient front ports with 2 x USB 3.0, 1 x eSATA and audio in/out buttons for easy connection to a range of peripherals. Mini-ITX desktop computer case with neat and clean interior. Fit in any location with its stylish and silver front bezel. A built-in 150W power supply unit provides sufficient and stable power delivery to your entire system.