Sound Dampening Material – Sound dampening material for optimal noise reduction (front, both side panels and top). Removable Sound Dampening Cover – The top cover panel can be removed to increased ventilation when need. Reversible, Steel Front Door – A reversible mounting system allows the door to open from either side of the case. Silencio Fans – Silencio FP 120mm PWM (800~1400 RPM) fans for a whisper-quiet performance and rubber padding to reduce noise vibration. SD Card Reader / Headset Jack – The I/O Panel features an SD Card Reader and single 4 pole headset jack for simultaneous audio and microphone capabilities.