CP-1A VIP uses an undersaddle tubular-style transducer , active-preamp powered by a single 9V battery. and mini gain pot. Excellent for any Resophonic, Dobro or Reso-Mandolin no matter style O (spider bridge) or Tricone, National or Beard or any other brand. Absolutely hum-isolated preamp in endpin-jack for live performances or studio recordings, immediate in response to the player's touch, impedance adjusted for direct P.A. line-inputs, extremely feedback-free for venue of any size. Installation in this type of instrument requires the skill of a professional luthier. We personally know less than 10 of such specialists Worldwide and can advise you in this matter. MSRP 299.- (export outside the EU or with valid EU VAT number).