This is the incredible True-Tone microphone system for acoustical instruments! There are two significant features of this system which are not replicated in any other available product. First, the microphone is easily mounted inside any acoustical instrument. No mounting holes are used, owing to the unique clamp mounting system from BMA Enterprises. The acoustical instrument is not modified in any way to use this system. The second important feature is that the microphone can be easily positioned anywhere inside the acoustical instrument body owing to the flexible mounting system. This allows infinite control over the instrument's sound. Uses standard 12mm 3v watch battery (included.) Get the True-Tone and rediscover your guitar. Click the "Add to Cart" button to place the item in your shopping cart. We offer it for $89.99.