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This is a very competitively priced security DVR and there is a reason for that, it is stripped down to only the very fundamental features. The unit ships without a hard drive and an underpowered AC adapter. Once set up, the unit is capable of high quality H.264 recording of up to 4 cameras, one with audio. H.264 is the best possible choice for video codecs. The problem begins with configuring the unit. The remote control is limited and confusing. A mouse needs to be connected to do anything more useful. There is no sensible “rewind” built into the remote control. The playback search feature is barely functional. There is no way to manually delete a particular recording from the list. Audio / Video sync problems are present on long playback of recordings from a camera with a microphone. This is a very competitively priced security DVR and there is a reason for that, it is stripped down to only the very fundamental features. The unit ships without a hard drive and an underpowered AC adapter. Once set up, the unit is capable of high quality [[H.264]] recording of up to 4 cameras, one with audio. H.264 is the best possible choice for video codecs. The problem begins with configuring the unit. The remote control is limited and confusing. A mouse needs to be connected to do anything more useful. There is no sensible “rewind” built into the remote control. The playback search feature is barely functional. There is no way to manually delete a particular recording from the list. Audio / Video sync problems are present on long playback of recordings from a camera with a microphone. Due to the unrefined nature of this Chinese product, which seems as though the software just was never “finished,” as well as it being shipped with an underpowered AC adapter, it is difficult to recommend purchasing it. Unless you are really limited in budget, spend more money and get a finished DVR product. Some positive points to this product include the ability to remotely program it from a web browser. It is also possible to monitor live camera feed over a network connection from within MSIE, with camera audio. Timer record configuration and audio monitoring is only possible using Microsoft Internet Explorer on a PC. Only basic viewing of camera video can be done from other browsers or mobile apps (Android and iPhone.) Due to the unrefined nature of this Chinese product, which seems as though the software just was never “finished,” as well as it being shipped with an underpowered AC adapter, it is difficult to recommend purchasing it. Unless you are really limited in budget, spend more money and get a finished DVR product.