Normal dust from sitting in a studio for years. Works great. Power cable included. The Sonnet Echo Express III Rack mount 3x PCIe Thunderbolt 2 Enclosure is a high-quality PCie chassis designed for use with Thunderbolt 2 external interfaces. With a maximum data rate of 10 Gbps, this unit is compatible with a variety of Apple devices including MacBook Air, Mac mini, Mac Pro, MacBook, MacBook Pro, and iMac. The rack-mount design allows for easy installation and expansion of PCIe cards in a professional setting, making it a versatile and reliable option for enhancing your computer's capabilities.