EPM Corp. "The Cap" Piezo Pickups AGT100

An excellent entry-level contact transducer. The patent-pending transducer head fits neatly into a beer cap, and dozens of breweries have contributed their caps for use in the product. It attaches simply and easily to a surface with a re-usable adhesive that will not mark or affect the surface. A short cable with a 1/4" female connector is attached.