Uses a hard disk drive to record not included 4 video inputs with 1 audio channel Built in quad processor Motion detection record feature Record up to 2025 hours of video on a 120 Gb HDD4 level video quality adjustment This DVR Digital Video Recorder has a whole host of features making it an ideal replacement for a time lapse VCR. It has on-screen display with RTC Real Time Clock supports multiplexers a built in quad processor picture zoom channel labels alarm input & video loss in fact the list of features goes on & on. The big advantages of a DVR over a time lapse VCR are the amount of video you can record up to 2025 hours using a 120 Gb HDD or more with a larger one recording times are variable & depend on recording resolution & frame rate settings per camera installed. You dont need lots if different tapes just one HDD will be sufficient for most applications. Note This product is supplied without a hard disk drive. Please see the computerhard disk section for the latest range. You will require an IDE UDMA66 or above HDD. The larger capacity you buy the greater the recording time will be available. The HDD is mounted in a key locked removable caddy & additional HDD caddies are available order code L20AZ