BQLZR Mandolin Dual Twin Internal Sensor Transducer Pickup With 1/4 Inch Endpin Jack The Mandolin Twin Internal transducer delivers better sound for you because of the internal mounted pickups Includes stereo TRSS endpin jack ,this Mandolin twin internal is a twin-head transducer. Both the tranducers and the endpin-jack are mounted inside the Mandolin. Special super-thin and strong peel-and-stick tape are attached on the transducers. Impedance: High ohmic