This is our new high performance under-saddle transducer. Installed in all Pono 'ukuleles, and also an excellent retrofit 'ukulele pickup for any passive saddle applications. Easily converted to an "active" system with the use of an external outboard preamp. The new "Pono" pickup provides accurate acoustical production, great tonal qualities, even string balance, and ease of installation (simply plug in, no soldering). Four individual highly sensitive piezo crystal sensors. Note: saddle slot width requirement is 3/32" (.093) or larger