Thirty-three millimetres by thirty, ten grams, and it reports its own position and orientation twenty times a second — a global-shutter sensor and a six-axis IMU feeding an estimator its maker spent twenty months tuning, out over USB, UART or MAVLink at 0.8 W peak. The tell that it is finished rather than nearly finished: you flash the firmware and run the calibration in a browser tab over WebUSB, with Rockchip’s flashing tool compiled to WebAssembly.