Really like this clock
For NTP WiFi LED Matrix Clock with Seconds
I got the green one for subdued visibility at night. Very readable during daytime and not too bright at night so the day/night transition works well. The board uses a built-in mercury switch for upside-down operation so the USB-C plug can come out either direction. I did have a few complaints about the firmware operation but the seller communicated effectively and over the course of a few months solved the problems. Very satisfied with YIHANG.
