Features: A raspberry pi cooling fan that prevents overheating on the Raspberry Pi 3 B and Raspberry Pi 4B. Comes with a power button that can be used to do safe shutdowns and reboots to the Pi. PWM Controllable and Software controllable fan for excellent functionality and customizability. Usable in multiple projects, especially for Raspberry Pi Servers where Raspberry Pis are stack Works perfectly with other products like the Argon NEO and Argon POLY+ Specifications: Material: plastic and metal Size: 65x57mm/2.56x2.25inch Packing bag: OPP bag Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Piece Fan Hat.