SIIG's long-term business vision, comprehensive product line, effective marketing strategy and exceptional customer support have made SIIG the leading brand for computer add-on products. High-quality control standards are evident by one of the lowest defective return rates in the industry. PRODUCT FEATURES: Easily adds two external (eSATA) ports to your desktop computer for external drive connections; Supports Native Command Queuing (NCQ) and SATA TCQ commands; New Serial ATA cable - easier to install; Easy plug-n-play installation to your external serial ATA drives; Supports SATA hard disk hot plugging.