Compact 4x2 USB2 audio interface. As the "c" appended to its name implies, the updated MicroBook IIc is now USB audio class compliant, which means that you can connect it to an Apple iPad with a standard Lightning to USB Camera Adapter (purchased separately) for studio-grade audio I/O for your iPad music and audio apps. If you are serious about the music you make with your iPad and laptop, the MicroBook IIc offers the perfect combination of excellent analog audio quality, studio-grade connectivity and rugged, ultra-portable design and construction. When connected to an iPad, the MicroBook IIc is powered by a standard Micro-B-to-Type-A USB cable with attached AC power adapter (both included). This helps preserve maximum battery life for the iPad. When connected to a Mac or PC, the MicroBook IIc is bus-powered by the USB connection to the computer. No separate power connection is necessary.