ZOSI 720P AHD-TVI Security Camera System,1080P Lite Video DVR Security System and 4PCS 1500TVL 65ft Night Vision Outdoor/Indoor Surveillance Camera (1). HYBRID Capability 4-in-1 DVR:With self-adaptive technology,it supports 4 kinds of camera models:Analog,720P AHD,720P TVI and CVI (2). QR code scan via mobile device using our free ZOSI View app (available on iOS/Android).Live view and playback on your smartphone. (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(Needs an internal hard disk,20g/day/CH for 720P ,it can't record or playback without hard drive) (5). All systems CE & FCC certified with qualified power supplies.Guaranteed for 2 Year & Free life time Tech Support