Here is a clip-on headphone amplifier that functions as a volume booster for your favorite portable media player. Known as the Fiio E5, the gadget has an Apple-style clip and measures at only 44mm x 38mm x 12.2mm. The Fiio E5 is able to produce 150mW (at 16O; or 12MW to 300O) power output with under 0.009-percent distortion at 10mW. It can last for up to 20 hours of continuous audio playback before requiring a recharge. The Fiio E5 retails for sub-$20. [GenerationMP3]
