iFi Audio Go Blu is a super compact bluetooth headphone dac / amp that can also be used as a wired dac amp with a computer or phone. It has the latest bluetooth connectivity, for the best possible sound quality over bluetooth, has both standard and balanced outputs and more power than almost any other compact BT dac we have seen - perfect for multi driver earphones and over ear headphones.
iFi Go Blu review : Whathifi.com: 5 stars, Highly Recommended
iFi Go Blu specs: