Wave is another MIDI controller ring, but this one has buttons - The Verge
Genki Wave: Introducing the midi controller ring for musicians - Soundbrenner
Enhancia Neova MIDI Ring Controller with Hub. Advanced gesture MIDI controller with standalone CPU and nine ultra-low latency sensors. Distributed by Roland. : Amazon.com.au: Musical Instruments
6 Of The Best Unusual MIDI Controllers 2018
Enhancia Neova Expressive MIDI Ring Controller
Midi Fighter
Midi Fighter
Amazon.com: Neova MIDI Ring Controller. Advanced Gesture MIDI Controller with standalone CPU and Nine Ultra-Low Latency sensors. : Musical Instruments