The FIVE.O is small, light-weight, and best of all, specifically
  engineered to track the uke’s unmistakably unique voice. The
  system combines a custom version of our award winning Element
  pickup, a soundhole mounted volume control, and a miniature
  endpin preamp powered by a 3V battery. We radically miniaturized
  our design so that the complete system weighs less than a 9V
  battery and tucks away neatly inside of the small instrument for
  a non-invasive installation. The pickup also features a pull
  guide to facilitate faster installations.