One of Antecs most cost-effective cases, the NSK 4000B II mid tower case brings you environmentally friendly features together with the latest Quiet Computing™ technologies. Antecs award-winning New Solution Series always provides sensible, high-quality cases & the NSK 4000B II is no exception. With a stylish front panel now featuring HD Audio In & Out jacks plus two USB (Universal Serial Bus) 3.0 ports, the NSK 4000B II is quiet, cool & energy-efficient: the perfect solution for your next build.