The Kommander is a handheld dual infrared X-Y motion controller, designed to make ‘controlling your electronic instruments intuitive and fun’.
Recently I have acquired two Kommander`s from Koma Elektronic. The Kommander`s provide the Serge modular synth with gate and CV signals by tracking my hand movements.
This is very similar to the possibilities of the Theremin, but in a much smaller package.
The Kommander is priced at 59 Euro. More info on the Kommander can be found at the Koma site.