Professionally, I am traveling a lot, even though I like to listen to music. To improve the quality when listening, I decided even for such a small headphone amplifier. At first I was not sure if what is for me, also the handling. But just plug it in and get started wow what is now part of a great sound comes out of my iPhone is truly remarkable. Worthwhile (although my wife this still will not quite believe ;-)). With the technology behind it I know my not so made, was more of a tip from my local shop where I bought the DA-10 also. The thought that you can among other things home to connect to the amplifier device. Note: It is best to be to also set a clever headphone, not those cheap in Ears or similar.