TASCAM DR-40 4-Track Portable Digital Recorder XLR / TRS balanced MIC/LINE inputs with phantom power and +4dbu line level input. Takes AA Batteries (Best with Polaroid AA Batteries) Switchable microphone position from X-Y to A-B. OS - Windows XP,Windows Vista,Windows 7,Windows 8 4-track recording - record the built-in microphones and mic inputs at the same time Dual recording captures a safety track to prevent distorted takes Up to 96Hz/24-bit resolution