The Zoom H4N in an portable audio recorder with an onboard stereo mic in X/Y postion setup (adjustable from 90-120 degress), which records up to 24bit and 96khz PCM WAV / BWF.
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.
Thanks to its tripod mount you can easily fit in on your DSLR rig setup. Woth mentioning is also the low cut filter and comressor/limiter to reduce unwanted background noise and optimize the dynamic range while preventing distortion.
The Zoom H4N records on SDHC card up to 32GB and it's batteries hold for 6 hours (11 hours, when recording in 16bit / 44.1khz).