DVRPLUS SJ-5004AI is a state-of-the-art MPEG-4 triplex 4-channel DVR, featuring a powerful embedded RTOS (real time operating system). While improving overall video quality, the revolutionary MPEG-4 video codec processor (video encoder/decoder), offers state of the art performance in both the recording time efficiency (file size) and video quality. Full triplex capability ensures uninterrupted recording.