The robot in question is a skid-steer 4-wheeled toy, to which he has added an ADNS3080 mouse sensor fitted with a lens, an H-bridge motor driver board, and a Wemos D1 Mini single board computer.

ThePulsar X2V2 Mini is a compact white gaming mouse ... uses a 2.4GHz dongle for a low latency connection. The mouse has durable optical switches and a solid overall built quality.