Fiio E11 Portable Headphone Amplifier - Black (1 x BL-5B)

Pros: - Feels like and is a high quality product. - Long lasting battery, as long as you turn it off after use. - Low price - Integrated 2-step equalizer - Exhangeable battery - High/low gain control switch for headphones with high or low impendance. - USB charging - CE-approved (unlike many other DX products)

Cons: Not many cons at all, for the price this is truely a bargain. - No integrated DAC - Cannot be used while charging. - As long as it's turned on even with no sound input, the battery seems to be drained as fast as if used.

Other: I use it with my Audio Technica ATH-M50 headphones, and it is absolutely brilliant. Especially the bass feels much more powerful and quicker than without. I use this with both my laptop and portable devices. I have also testet it with several other headphones and earplugs, and it improves the feel of the sound by huge amounts.