e-ther 'Advance' : e-theremin, MIDI / audio with quantisation and note display

This is a MIDI controller. It's played with gestures in the air like a theremin and can output:
- MIDI over USB (now a USB-C socket)
- MIDI over TRS (a TRS/5-pin DIN lead (type A/Korg) gives MIDI over 5-pin DIN)
- audio (now built-in, not an optional extra)

In addion, the e-ther Advance adds:

- screen and menu system on-device
- quantisation
- display of nearest / target note

(See another listing for the 'Classic' version of this device without these extra features.)

e-ther's sensors don't use visible light and therefore aren't affected by changes in ambient light. They measure distance very accurately (invisible, eye-safe) making e-ther very predictable and consistent. 

The MIDI output means that you can use it in a variety of scenarios - with electronic instruments or 
DAW. There is some configurability of the vertical control which can send expression or modwheel messages.

The manual has more details.