http://www.zoom.co.jp/english/products/h4n/
Its onboard X/Y stereo condenser mics are arranged with the right and left mics on the same axis. This design ensures that the mics are always an equal distance from the sound source for perfect localization without phase shifting. Frequency response remains uniform throughout your recording. The result is great stereo recording with natural depth and accurate imaging every time.
The H4n is the only handheld recorder that features built-in combination XLR/Phone connectors with phantom voltage source capability. With its Hi-Z inputs, you can record guitars or other line output sources such as mixing consoles. A separate external mic input supports plug-in power microphones.