You love your MP3 player, but even with great headphones and the volume cranked, it is still not loud enough.
Insert the amplifier into the headphone out of your MP3 player, then plug your headphones into the amplifier's output, and you'll get an immediate 4x's increase in volume.
You cannot beat the sound that the Boostaroo MP3 amplifier provides. Our amplifier gives your MP3 player enough power to drive headphones rated up to 300 ohms.
MP3 Amplifier - MP3 Audio Amplifier