Firestone Audio Fireye 1 - Micro Headphone Amplifier

I bought this headphone amp to get louder sound from my ipod nano through my AKG K271 55 ohm headphones. The amp hardly made a difference in volume with the ipod nano however it did add a noticeable amount of noise. I then tried the amp on my stereo system and got blasted with volume. I'm not sure why this happened since the unit is supposedly powered by its own battery. Also, when I had the amp plugged into my stereo, it created enough noise to be very distracting. I found this product to be of poor quality and useless.