This 2-Pack HK Wantat fan is a high-quality and reliable addition to your computer's cooling system. With a maximum rotational speed of 6000 RPM and a noise level of 23.2 dB, this fan is designed to keep your server running smoothly without any disruptive noise. The fan diameter is 40 mm and it operates on 24 volts (DC) with a 2-pin power connector. The fan is equipped with dual ball bearings and a cooling method of air. It is compatible with a range of devices and has a product dimension of 1.57"L x 1.57"W x 0.39"H. This fan is perfect for those who want to upgrade their computer's cooling system and ensure that their server runs smoothly.