Upgrade bearing of this fan not only can make sure provide a lot of wind, but also quiet enough.Completely solve the overheating problem of your for Raspberry Pi 4 Model B, 3 B+, Pi.Better Terminal Interface: It with two terminals, its' connector is separating, One-to-Two interface, can choose 3.3V or 5V. According to the voltage requirements in accordance with your needs to choose which to use.Colour: blackMaterial: ABSSize: about 30x30x7mmPackage Contents:4 * For raspberry pi fan16 * Nuts16 * ScrewOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.