I write about the items I order normally no review, but since this unit was given a rating I have to give my two cents that it does not deserve. I use this to my preamp signal from the tablet to enhance and pass on my final stage of the boxes. No one could give me a hint how I can pre-amplifying a reasonable performance from my Tablet. With these small fine device I could amplify the signal as I got it with my PC with a super sound card directly to the final stage, if not even better. I have been 4 decades a sound freak, and yet I came almost in tears when I got to hear what I was offering this device as listening. I think as a prerequisite, you need a good amplifier and good speakers to this unit is optimal to use and also to take full advantage of its quality also ..... have fun with this great little tool