More importantly, these DVRs offer voice-activated recording that immediately begins recording the second it detects sound. Also included is automatic date/time stamping, multiple playback speeds, and built-in editing functions. Note that all records are stored in the VOC format, which isn’t compatible with Windows Media Player or iTunes. Another problem are the non-intuitive user controls. The RCA VR5220 and its peer rely on multi-function buttons that must be pressed in different directions to toggle a specific function.