The E6 Stereo Headphone Amplifier from Fiio is an ultra-compact headphone amplifier that increases the volume and audio quality of your portable music player. The amp has an advanced circuit to offer a high signal to noise ratio, wide dynamic range, and minimal distortion. The amplifier has standard 3,5 mm input and output connectors for compatibility with a variety of music players and headphones. There are power and volume controls, plus 3 types of DSP-based EQ so you can adjust bass and treble. A key lock function prevents accidental changes. The amplifier has a built-in rechargeable Lithium battery that provides approximately 10 hours of operation. The battery is charged via a mini USB connection for convenience. - Included: USB cable, Jack / Jack straight 80 cm cable, Jack / Jack angled 12 cm cable, 2 x clip - Dimensions: 41 x 40 x 9 mm - Weight: 16 g - Colour: Black.