DVR device SL-HCVR7216AN-4M 16CH Shield

In fact, a DVR is an electronic device. CCTV images are transmitted to it via a cable that connects to the input of the DVR. These images are encoded and processed inside the DVR. Of course, there is now a new generation of DVRs on the market called HD-DVRs that have the ability to support HD analog cameras with very high resolution. The facilities available in this type of recorders and their reasonable price have led to the abandonment of the use of old DVRs.

DVRs or HD-DVRs have multiple input and output ports, including audio output ports for speaker connection, audio input ports for microphone installation, HDMI and VGA video transfer ports for monitor connection, and CVBS ports for Connect to a TV, LAN port with different bandwidth to connect to the network or switch device, alarm output, USB port to connect a mouse or keyboard. Each of the listed inputs or outputs is not the same on all models, and some models may not have an audio input port, for example.

Some of the main uses of a DVR are as follows:

CCTV image recording: The DVR device can record CCTV images (through the hard disk installed in the device) and review or backup.
View CCTV images seamlessly: By connecting the DVR to the monitor, you can see the image of all cameras seamlessly on one screen.
Adjust images and recordings: The DVR lets you adjust the images to your liking. These settings will include light and color settings, type settings and recording timing.
Ability to connect to the network or transfer images: Through the LAN port on the DVR, you can import images of your cameras into the computer network environment or view them via the Internet.
Rotating Camera Control: You can control rotating cameras or zoom cameras via the RS485 port on the DVR.

Of it:

Standalone Digital Video Recorder: Standalone DVR is capable of recording and playing back images using a monitor.
PC-Based Digital Video Recorder: The recording and playback system of the PC-Based DVR is based on the operating system. In fact, the operating system is installed on your computer. Therefore, it is possible to record images on a computer hard drive.

Output based DVR:

DVRs are usually classified in several ways, but the most important aspects of their classification are the number of DVR video channels and the quality of DVR recording.
The most common DVR devices in terms of the number of video channels are the following DVRs: DVR 04CH channel: can install up to 4 cameras.
08CH Channel DVR: Can install up to 8 cameras.
16CH Channel DVR: Can install up to 16 cameras.

Advantages of using a DVR device:

lower cost
No worries about signal weakness
The biggest advantage of a DVR receiver is that it does not use the Internet and consequently does not interrupt the image.
Ease of use

Disadvantages of using a DVR device:

Lots of cabling: From each analog CCTV camera, at least one wire is connected to the back of the dvr. As a result, the number of cables increases. Wiring also restricts the installation position of the CCTV camera.
Lower image quality: Although advances in technology have increased the image quality of the dvr, its quality still cannot match that of the NVR.
Impossibility of remote connection: CCTV cameras should not be installed at a distance from the dvr device so that the signal is not disturbed.

The above DVR Shield device is produced in the dimensions of 375 × 287 × 53 mm and weighs 2.35 kg and is sold in the market of CCTV cameras and security equipment with excellent construction quality and durable body. This DVR device has 16 video input channels and uses HDMI and VGA video output. DVR Shield device is compatible with iPhone, iPad, Android smartphones. This DVR has 2 hard drives with SATA interface and has a maximum capacity of 8 terabytes. The SL-HCVR7216AN-4M DVR can be connected to HDCVI / AHD / TVI / CVBS and IP CCTV cameras and has a resolution of 2560 x 1944 pixels (5 megapixels).