A see-through panel in blue. The SSD1309 takes the same commands as the SSD1306, so it runs on the same code.
Its glass shows 128x56 of the 128x64 the controller drives, so the top or bottom row of the status pages may sit just outside the transparent part.
On the M5Stack Unit PoE-P4 it plugs into the Grove port. On another board, wire it to the capture board's I2C bus, or name two pins as OLED SDA and OLED SCL under Settings → Display.
This is the Glass2. The first Unit Glass has a small microcontroller in front of its panel that speaks its own protocol, and is not supported.
Not tried on one yet.