You might think awesome sound quality is hard to achieve on the go. If so, wed like to present the handy AudioQuest dragonfly Cobalt USB DACheadphone . Its roughly the size of a thumb drive, and it plugs into your phone or computer to deliver premium, high-precision sound. AudioQuests highly successful DragonFly models put the USB DAC category on the map, and the Cobalt looks to be the best one yet. It makes for an easy and very effective upgrade to your portable or desktop listening setup. Native Resolution up to 24-bit 96kHzDAC Chip ESS ES9038Q2M DAC chip with minimum-phase slow roll-off filter for more natural soundPlays All Music Files MP3 to MQA and Hi-ResCompatible with iOS Mobile Devices requires Apple Lightning-to-USB adaptor and Android Mobile Devices requires USB adaptorDimensions 57mm l x 19mm w x 12mm hConnectivity technology WiredConnector type USB Type A