The AMT VSW - Sennheiser Clip-On Condenser Microphone System was design to operate with Sennheiser wireless systems. The VS is a ultra miniature, feather weight low profile condenser microphone specially designed for the violin, viola, and mandolin. The microphone attaches to the violin, viola, and mandolin with a clamp designed for be solid on the instrument without harming or dampening the natural sound or vibrations. The microphone provides pure tonal reproduction without being unobtrusive. With the included AMT Interface, the microphone can plug directly into the interface which then plugs directly into Sennheiser wireless units. Requires phantom power.