Mainly because it provides an electrical plug-in for electric guitars and basses. But as soon as I showed it to my guitar master, said the only: "This is also available as app for free, more sensitive and more precise, I was told." And I took my 'mobile' and looked after: Actually ... And not the poor or unprofessional or whatever. So for the guitar which is then probably nothing more, was my first thought. Hab earlier brought the A from the telephone handset ;-). Therefore, I would not buy it again - even if it can not hurt to have secure. At the end I'll still electric guitarist? I also want cell phones do not have lying around still open. But one reason for the unit as an acoustic guitar player.