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The ZMD-DD-SBN8-500gb system is fully integrated and formated with a 500gb hardrive. This much memory allows for 2 to 3 weeks of record time. This is a good DVR for any small business or home with the features it offers. This DVR allows for you to remote view it on your smartphone or any 3g mobile device. Also it is capable of viewing up to 8 cameras at once. It does not require such a big powersource, just a standard wall plug is perfect. So just plug n play and you can get started on protecting your business or household.