This 4-channel motion detection DVR includes an 80 GB hard drive for up to two months recording time. Need more? It's also upgradeable to 6 months recording time with a 250 GB hard drive (not included). No special cameras are required. Features 4x zoom control and picture-in-picture, four camera connections and color quad processing. There's even one audio input for a microphone or for a camera with audio. Easy-to-navigate menu, easy search feature and adjustable playback speeds. Record in Manual mode, Alarm mode, Timer mode or Motion mode. Includes RCA and BNC connectors.