Fiio E3 A pocket sized headphone amp designed to improve sound quality & boost volume (if required) when listening with headphones or earphones to an MP3 player (such as the iPod) computer mobile phone or other portable devices. The Fii O E3 also reduces battery drain on portable devices which means you can enjoy your music for longer. The Fii O E3 is a dedicated headphone power amplifier designed to improve your mobile listening experience. Portable devices often have low powered headphone outputs & find it difficult to drive regular headphones & earphones. With the Fii O E3 you can ensure you are getting the best out of your portable audio setup. With a sound signature that adds depth to the bass & enhances detail of the trebles the Fii O E3 is a worthy upgrade to any portable audio setup. Simply connect the Fii O E3 between your portable audio device & headphones for a great audio experience. The Fiio E3 is powered by a single AAA battery & it is switched on by simply plugging a set of headphones into the 3.5mm output jack Summary The Fiio E3 is a Midget Gem amounst Headphone amps small compact & lightweight it sits in-line giving your pnone or player that extra punch its been lacking. Features Boost volume & improve sound quality of headphones & earphones. Ultra small lightweight design for MP3 player laptop or mobile phone. Ultra small lightweight headphone amp for iPod MP3 player laptop or mobile phone. Reduces battery usage of portable devices. 3.5mm jack input & output socket. Powered by single AAA battery.