Available in three passive models and one active preamped model. It took several years to accomplish but we finally produced a resonator guitar pickup that met our exacting standards. For faithful sound reproduction, ease of installation, great anti-feedback characteristics, and so much more. Until we designed the RG-03, all resonator pickups were either stuck onto the side of the cone (which invariably caused feedback issues) or else required the replacement of large parts of the resonator assembly (not to mention a lot of expense and probable modification to the instrument). There also were some magnetic pickups that were meant to fit under the strings at the end of the fingerboard - but these were never particularly acoustic sounding The RG-03's in passive format are available with your choice of either an endpin jack or one of two jack assemblies (one with a volume control) - both of which simply adhere to the instrument and snuggle in right next to to the tailpiece. Featuring our new MVC jack assemblies, which simply attach to the underside of the existing tailpiece or the area next to the tailpiece. For those players who want an on board preamp, the RG-03A is the active version in the lineup and combines the RG-03 sensor with our Artist II endpin jack preamp that may be run from phantom power - so no battery need be installed