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An electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device.
There are manyfactors when you need buy a DVR,these are:
The number of cameras supported
Frames per second (fps)
Hard drive space
Remote viewing capability
Ability to save video and audio to a CD or flash drive
Frames Per Second
The frames per second (fps) relates to how many pictures the DVR will record in a second.
Real time recording is about 30 fps on each camera.
Hard Drive Storage
The amount of hard drive space is very important because it will limit how many days of recording you can store before the system has to start recording over the oldest video.
Hikvision 7216HGHI 16/32 Channel DVR have:
H.264 & Dual-stream video compression
Support HD-TVI/analog/IP camera triple hybrid
Support both HD-TVI and analog cameras with adaptive access
Full channel@720P resolution real-time recording
HDMI and VGA output at up to 1920×1080P resolution
Long transmission distance over coax cable
Support up to 16-ch synchronous playback at 1080P resolution