Robin Good: The Mikey Digital is a portable, pocket sized microphone designed to work with your iPhone, iPod Touch or iPad (unfortunately, a lightning adapter is required for the iPhone 5 and iPad mini. The adapters are available for $29 through Apple) and ready to record both quality live sound as well as interview voices and electric instruments that can plug directly into its dedicated plug.
From the official site: "Featuring two custom-tuned Blue capsules for stereo recording, a line-input, USB pass through and a stylish updated 230-degree rotating design, Mikey's three gain settings allow for a versatile recording experience for everything from a loud concert to a whisper."
From the Mashable review: "Guitar players can plug cables directly into the device through the input and sync their instruments with a number of recording apps, which give users an experience similar to having thousands of pedals and cabinets to work with."
Reference price: $99
Supported audio apps: http://www.bluemic.com/mikey_digital/#/applications/
Audio recording sample: http://www.bluemic.com/mikey_digital/#/audio/
Find out more: http://www.bluemic.com/mikey_digital