Pitch and Volume Theremin professionally crafted by Theremaniacs. Makers of fine Theremins for decades. In use the world over. Battery operated and will last a year or more on a common 9 volt. Simple and compact design with easy access battery door unlike similar Theremins that require disassembly to replace the battery. A common 9 volt cell will last so long that it becomes useless to add a power supply cord. No extra cords to get in your way! Good sounding signal and standard output level to drive your amplifier. Mic stand mountable. (Stand not included) Automatically turns on when guitar cord inserted and turns off when cord is removed. Rugged and proven sound quality. Wide selection of setting positions due to the modular design. Set the two units near together or far apart for your playing comfort unlike many Theremin designs that do not provide enough space between the two antennas. Each antenna can be set to its own individual height and distance apart. The two units can also be separated and used independently. The pitch can be used by itself or the volume can be used on any pitch style Theremin or optical Theremin. The knob on the pitch unit adjusts starting pitch, sensitivity and null point. the knob on the volume unit is the final volume control. Can also be set horizontally on mic stand to play in a vertical motion. Pitch range is easily set for a comfortable 2.5 feet (arm’s length) and can be adjusted to act in the opposite manner. (Pitch lowers as hand comes near.) 23 inch antenna can collapse into the case for easy transport. Bottom of antenna can act as a momentary volume squelch by touching a small area of the threading that protrudes from the case. Volume unit works in the traditional manner and can also be set to operate horizontally or vertically. Plugging in a common mono guitar cord turns the unit on. Comes ready to play with a 9 volt battery installed. All Theremins made to order by hand. Can we make one for you?