The MB884 is a cooling device designed for most 3.5" single bay external enclosures. It uses a 122 mm diameter fan to absorb heat out of an enclosure to keep the temperature at a standard level. The convenience of this cooler is that it can attach to most external enclosure design, whether it is built to stand vertically or facing horizontally. The fan runs on a USB, so it is convenient to use on any nearby computer with the enclosure. The retractable clip allows it to hold on to any sizable enclosure and the neck on the clip can extend to adjust with any height. With two thousand rotations per minute and at a noise level of only 24 dB (A), this is the perfect accessory for those who worry about heat issues on their external hard drive.