The SOLO II emphasizes Quiet Computing & reinvents Antecs renowned Sonata line with a new set of attractive, practical features. Externally, the SOLO IIs dual-layer 1.0 mm SECC/polycarbonate top & side panels absorb noise for exceptional sound dampening. To reduce vibration-related noise, the dual hard drive mounting system gives you the option of mounting your hard drives using tray mounts with silicone grommets or the tool-less suspension mount system. SOLO II features an anodized aluminum front bezel & piano black exterior for an elegant, professional appearance. With washable fan filters & two front panel USB (Universal Serial Bus) 3.0 ports, the SOLO II is the rebirth of Quiet Computing.