The AudioQuest Dragonfly Cobalt USB Digital-to-Analog Converter is the latest and most sophisticated member of the award-winning DragonFly franchise. It is a USB DAC (digital-to-analog converter), preamplifier, and headphone amplifier that bypasses the audio circuitry in laptops, computers, and smartphones to deliver cleaner, clearer, more naturally beautiful music to headphones, powered speakers, or complete audio systems. A red lens indicates that the device is in standby mode; purple indicates MQA playback. It plays all music files like MP3 to MQA and Hi-Res. Compatible with computers, tablets, streamers, and mobile devices. Includes DragonTail USB-C Extender Cable (iOS mobile devices require Apple Lightning-to-USB adaptor). Resolution up to 24-bit and 96kHz. The DAC chip is ESS ES9038Q2M DAC chip with minimum-phase slow roll-off filter for more natural sound. Compared to previous models, DragonFly Cobalt incorporates new features, including a more advanced ESS ES9038Q2M DAC chip with a minimum-phase slow roll-off filter for more natural sound; a more sophisticated Microchip PIC32MX274 microprocessor that reduces current draw and increases processing speed by 33-percent; and improved power-supply filtering specifically designed to reduce the Wi-Fi, Bluetooth, and cellular noise that plague mobile devices. With AudioQuest’s DragonFly USB DAC, music appreciation and exploration are limitless. Plug into an Apple or Windows computer or connect to an iOS or Android mobile device. Play YouTube or Vimeo videos. Go hunting on Bandcamp or SoundCloud. Explore playlists and podcasts on Spotify, Pandora, or Deezer. Stream high-res audio from Tidal or Qobuz. No matter the choice of sonic pleasure, DragonFly unravels the emotional expression and nuance that makes music and movies so enjoyable. For easy reference, DragonFly's LED changes color to indicate playback status or sample rate. Cobalt's precedent-setting performance is made possible by multiple significant upgrades: a new, more advanced ESS ES9038Q2M DAC chip with a minimum-phase slow roll-off filter for more natural sound, Microchip's superb PIC32MX274 microprocessor draws less current and increases processing speed by 33-percent, and improved power-supply filtering that specifically increases immunity to Wi-Fi, Bluetooth, and cellular noise. It includes a form-fitting DragonTail female USB-A to male USB-C Adaptor. All DragonTails use AQ's Carbon-level USB cable. Like all previous DragonFly models, Cobalt uses Gordon Rankin's precedent-setting StreamLength asynchronous-transfer USB code. Further, in Gordon's monoClock technology, a single ultra-low-jitter clock generated from the ESS ES9038Q2M DAC chip runs the ESS chip functions as well as all microcontroller functions. This superior clock enables DragonFly Cobalt to provide greater resolution and clarity than DACs with multiple clocks. Cobalt employs ESS's new flagship ES9038Q2M DAC chip. The minimum-phase slow roll-off filter in the 9038 results in naturally expressive sound that is always emotionally engaging and never fatiguing a beautiful combination of warmth and detail that the team finds equally exciting and soothing.