LR Baggs FIVE.O Undersaddle Ukulele Pickup Custom version of award-winning pickup for ukuleleLight-weight designNon-invasive installation R Baggs FIVE O ukulele system is small, light-weight, and best of all, specifically tuned to track the uke's natural dynamics and its unmistakably unique voice The system combines a custom version of the award winning Element undersaddle pickup with a miniature endpin preamp, soundhole mounted volume control and is powered by a 3 Volt coin cell battery