Great sounding ukulele pickup-Easy to install with no modifications.
From the Kremona Website:
Natural, detachable passive piezo pickup solution for ukulele
Encased in lightweight tone wood, UK-1 ensures natural sounding amplification of your ukulele without modification to the instrument. Utilizing the tension of tuned strings, UK-1 installs safely and securely on the tie bar of most ukuleles. UK-1 comes complete with a detachable, easily replaceable cable. When not in use, UK-1 may be left in place with no detriment to the instrument’s acoustic sound.
Instructions:1) Loosen the strings of your ukulele widely, leaving ample room to slide the pickup through the loops without pressure.
2) With the pickup flat on the tie bar/bridge, tighten strings normally and re-tune the ukulele.
3) Hold the pickup head securely when attaching and detaching the cable.