Model: ESP32-WROOM-32E WiFi: 802.11b/g/n ESP32 is a development module sold by Espressif. They are pretty cheap, have Wi-Fi and Bluetooth and can be used for stuff like sensors or tiny computers running simple stuff.
Bluetooth player
The builtin DAC outputs to GPIO25 (Channel 1) and GPIO26 (Channel 2). It is pretty low quality, 8-bit.
UART-USB converter
See https://techoverflow.net/2021/11/19/how-to-use-esp32-as-usb-to-uart-converter-in-platformio/
See also
https://github.com/geo-tp/ESP32-Bus-Pirate protocol sniffer over GPIO
