I do not know a lot about this …we got it in a collection of stuff …here is what we know ! 
Hooks up to your favorite computer and select iOS devices for true stereo recording with very low noise. TASCAM’ iUR2 is a premium sound quality audio interface for the iPad, iPhone and iPod touch. It includes all of the features of TASCAM’ best-selling USB audio interfaces, including a pair of great-sounding microphone inputs. The XLR inputs have phantom power for use with high-quality condenser microphones. These feed an onboard microphone preamp and A/D converter for better sound performance than those built into the iPhone and iPad ‚Äú true stereo recording with low noise and less tendency to distort. The inputs also accept line-level signals or you can plug a guitar or bass directly into your device.

A zero-latency monitoring path allows you to hear yourself directly through the unit, without any distracting delay. MIDI in and out are provided to interface with synths and drum machines, and a digital output connects to digital mixers or recorders.

Note: An appropriate 2-track recording application (Tascam PCM Recorder) can be downloaded from AppStore at no charge. Features

• USB 2.0 Audio/MIDI interface that works with Mac OS and Windows (supports WDM as well as CoreAudio and CoreMIDI)
• Can also be used with iPad/iPad 2, iPhone 4/4S or iPod touch 4G
• TRS balanced mic/line input (up to 24 dBu input level)
• Phantom power for condenser microphone (needs external USB power)
• Left channel switchable to instrument level
• Latency-free direct input monitoring
• Coaxial digital output
• RCA unbalanced line output
• Headphones output
• Audio resolution:
• 44.1 kHz/16-bit with iOS devices
• 48 kHz/16-bit and 44.1 kHz/16-bit with Mac/PC
• Supplies power to the iOS unit when connected to a USB bus
• Supports iOS 4.3 and later
• Can act as a docking station for synchronization (30-pin connector only)
• Tascam 2-track recording app can be downloaded from AppStore at no charge
• TRS/XLR conversion cables included to connect sources with standard XLR cables