Review on JUN-ELECTRON 3.5 inch Raspberry Touchscreen Display Monitor, 320X480 Resolution - E361 by Joe Larjin

This 3.5" touchscreen works when connected to unused pins on the Raspberry Pi 4 board, but requires special drivers. It's not clear how it works (it's hardly plug-n-play). This tiny display doesn't turn off when the Pi is turned off, and its fan can be noisy. Another annoying thing is that HDMI ports stop working after installing the drivers. Although a recipe for switching between touch/HDMI displays is provided, I've never been able to get it to work successfully. Pi 4 is said to support 2 4k monitors but not with touch enabled. Promising, but with functional problems.