ZOSI 4-Channel AHD-TVI 1080p Security Camera System,Surveillance DVR Recorder with (4) 2.0MP 1920TVL Indoor/Outdoor Weatherproof Bullet Cameras,1TB Hard Disk Built-in (1). QR code scan via mobile device using our free ZOSI View app (available on iOS/Android).Live view and playback on your smartphone. (2). 4 Channel 1080p digital video recorder with 1080p indoor/outdoor weatherproof cameras for true day and night monitoring with 65ft(20m) IR range (3). Ultra long continuous recording & easy USB backup:The DVR can be set to automatically overwrite the oldest stored footage,and you can backup the records via the USB backup (4). Intelligent motion detection email alert with images; Motion detection recording allows you save more capacity hard drive(2TB internal hard disk was pre-installed inside the DVR,40g/day/CH for 1080P ) (5). All systems CE & FCC certified with qualified power supplies.Guaranteed for 2 Year & Free life time Tech Support.//// Please refer to the last product images on the left side ,it will show you how to contact us for help ! Definitely respond within 24 hours!