This version of the popular K&K pickup system comes with the "Vintage Jack", allowing for installation without having to bore out the endblock; the "Vintage Jack" simply fits in the endpin hole already in the guitar. This system is for steel string acoustic guitars, 3 very small transducer discs are glued to the bridge plate and routed to the "Vintage Jack" via a mini-plug connector inside the guitar. Also included is a 4" adapter cable with a 1/8" mini-plug, which goes into the "Vintage Jack" on one end and a standard 1/4" female jack on the other for a standard patch cord. Passive system, preamp recommended. Professional installation highly recommended.