The Acoustic Modelâ„¢ is a piezo-electric transducer that can be mounted in any location on the guitarâ€™s top. A non-hardening putty is used to mount the pickup, allowing simple installation and removal. Every acoustic guitar has its own balance of highs, mids and lows, and itâ€™s easy to experiment with the position of the Acoustic Modelâ„¢ to determine the spot that achieves the best tone for your taste. It can also be semi-permanently mounted on the inside face of the guitar and connected to an acoustic endpin jack, so itâ€™s practically invisible. The Acoustic Modelâ„¢ works on all steel, bronze, and nylon string instruments.