Dual piezo pickup with two sensor plates (each 20 mm in diameter) for SH 712 is universally applicable and is glued onto the instruments. The Shadow SH-712 is a dual-disc transducer that is quick and easy to install, suitable for any instrument. The larger 20 mm transducers capture more low frequencies than smaller 12 mm transducers. The sensors are mounted on each instrument to detect vibrations and convert them into an electrical signal. The sensors adhere with the included non-permanent tack adhesive. It includes a 1-foot long cable with a 1/4 inch output jack.