<https://vilros.com/products/argon-mini-fan-for-raspberry-pi-4-with-built-in-heatsink-on-off-switch-pwm-controllable#Product>
<http://schema.org/description>
"\nWorks with Raspberry Pi 4 and Raspberry Pi 3 Model B boards\nThe Argon Mini Fan is PWM Controllable. It can be turned on at any assigned Temperature using Raspbian OS.\nThe switch can turn the Mini Fan on or off, and even set the Mini Fan to PWM mode for full customizability.\nA heatsink is also added to ensure contact with the CPU of your Raspberry Pi.\n"
<https://vilros.com/collections/raspberry-pi-fans>