At AudioQuest, we recommend iPhone users use the Apple Lightning-to-USB 3 Camera adaptor. A very small percentage of iPhone users have experienced a "clicking" when using the Apple Lightning to USB 2.0 Camera Adapter - this adapter has a single input port. Upon investigating/dialogue with Apple, we at AudioQuest discovered that this problem is resolved when using the Apple Lightning to USB 3 Camera Adapter. This adapter has two input ports on one end and a Lightning connector on the other end. | To connect the DragonFly Red to any Apple iOS device, We [AudioQuest] highly recommend Apple's Lightning-to-USB 3 Camera Adaptor. This device sounds better and is more reliable in this application than Apple's slightly less expensive Lightning-to-USB 2.0 Camera Adaptor, while it also adds the ability to charge your iOS device during playback. | "For greater overall performance, the DragonFly Red also incorporate improved 32-bit ESS Sabre DAC chips - the higher-performance 9016 is in the DragonFly Red - employing minimum-phase filtering for naturally detailed, more authentic sound. DragonFly Red includes the latest ESS headphone amp and a bit-perfect digital volume control that resides on the 9016 DAC chip itself-a sophisticated implementation that ensures maximum fidelity, dynamic contrast, and signal-to-noise ratio." | DragonFly Red is a USB DAC + Preamp + Headphone Amp. Small, affordable, easy to use, and remarkably effective, it plugs into your USB port to bypass the computer's compromised audio circuitry and deliver cleaner, clearer, more naturally beautiful sound to headphones, powered speakers, and complete audio systems. Now, any computer, tablet, or smartphone can be used as a true high-fidelity music player, allowing music lovers to enjoy beautiful sound wherever they go, whenever they please. | With its higher 2.1-volt output, DragonFly Red will be compatible with a wider range of headphones, including power-hungry, low-efficiency models. Whether you're listening to Spotify, YouTube, Tidal, ripped CDs, or state-of-the-art high-resolution files, DragonFly will deliver a more emotionally compelling and enjoyable experience. Most importantly, DragonFly is designed to honor the music you already own and love.