Active Piezo Pick-up for Ukulele MI-SI Trio Uke PARTICULAR SIGNS  Active endpin preamp with L.R.Baggs element   Battery free condenser system  Can be charged in 60 seconds   Plays for up to 16 hours  Incl. Charger and L.R. Baggs piezo pickup CASA OPINION Plug your ukulele 1 minute and it is gone for several hours of play! The sound quality is well there, there is a very good balance between each string, and the sound is very natural. The installation is rather simple but a retouching of the saddle is necessary, if you wish that La Casa takes care of the installation, click on "installation package".