TechPowerUp posted a review on the Quick Look: FiiO Q11 Portable DAC/Amplifier
A quote from the article:
FiiO, via its budget-focused sister brand Jade Audio, updates the popular Q1 portable DAC/amplifier with the new Q11 that uses a large integrated battery to drive more demanding headphones than competitors do in this price range. It offers 3.5 / 4.4 mm connectors in addition to using RGB indicator LEDs for both function and form alike.Quick Look: FiiO Q11 Portable DAC/Amplifier Review