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.<br><br>Colour: black Material: ABS Size: about 30x30x7mm<br><br>Package Contents: 4 * For raspberry pi fan 16 * Nuts 16 * Screw<br><br>Only the above package content, other products are not included. Note: Light shooting 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.