This field recorder operates on 4 AA cells or via an AC adapter. It records 16- or 24-bit uncompressed audio at variable sampling frequencies (44.1kHz, 48kHz, 88.2kHz, 96kHz â€“ limited to stereo x1 at 192kHz) to new SDHC compliant flash media cards. It includes built-in stereo microphones, and built-in speakers for stand-alone monitoring. Analog inputs on channels 1-4 are provided on XLR and 1/4" TRS combo jacks, and analog outputs are on 4 RCA jacks. Individual phantom power switches are provided for each channel. Digital I/O is provided via S/PDIF coaxial jacks. A USB-mini B port is provided for moving files to your Mac or PC. It includes an onboard limiter to suppress sudden peaks from your input source, a low cut filter, noise gate, de-esser, and other studio quality effects. A pre-record button buffers input signals to give you a few seconds of "pre-roll". A control sync terminal enables you to link 2 R44's together to get 8 total channels of recording.