The Schaller Model 747 (10/95) Undersaddle Piezo pickup is designed for nylon string/classical guitar. The complete system includes a specially designed pressure-fit nickel-silver plated endpin jack that replaces your existing strap button. The jack accepts a standard 1/4" mono instrument cable (cable not included).
The piezo-ceramic pickup sensor is mounted under the saddle. On many guitars, the endpin jack can be inserted directly into the hole for the strap button (hole may require enlarging or drilling through on some guitars). The pickup sensor lead wire attaches to the 1/8" mini jack, which can then be plugged directly into the "inside" end of the endpin jack.
Dimensions: Jack: 2.75" L x 13/32" W (at barrel). Pickup: 2 5/8" L x 3/32" H x 3/32" W; lead wire about 12" long. Mini-jack: 1" L barrel, 9/16" L x 1/8" plug.