This is an ESP32 running Dog. It has 3 LEDs that show if it is calculating ("thinking"), if there's an error or if it is pondering. The TTL-converter is for connecting a serial terminal to the device.
September 2025 I 3D-printed a nice box around it and replaced the ESP32 by an ESP32-S3 SOC.
Dog can speak the UCI protocol but has a tui (text interface) as well:
The ESP32 is a better chess-player than the dog Max, but Max can run faster.
Here's a video of Dog playing via a Digital VT510 terminal.
asciinema:
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