Rare to find Theremin - etherwave theremin big briar - - Connection Terminals: Audio Input - Adjustment Knobs: Volume, Tone, Balance Adjustment Knobs - Antennas: With external antennas - Design: Simple black casing Thank you for viewing. This is a theremin that is now difficult to obtain. Power-on confirmation has been done. There is no manual, so please check online. I purchased it from Ishibashi Music many years ago. Free shipping. I will send the items in the photos with simple packaging. Thank you.