The Theremin, a unique electronic instrument invented by Leon Theremin in 1920, has been reimagined with modern technology. The Luminiferous Theremin kit uses Time Of Flight (TOF) sensors, which utilize small lasers and photodiodes to measure the distance between the user's hand and the device. This innovative approach eliminates calibration issues and provides accurate and repeatable results. The kit's microprocessor allows for a wide range of sounds beyond the original Theremin's capabilities.

Source: https://extkits.co.uk/what-the-hell-is-a-luminiferous-theremin/