Video ? Kvadratory
Typically, in video surveillance systems used by a sufficiently large number of cameras installed to control of various objects. If the image of all video displays on the monitor and switches manually, then the time between viewing with the same camera, strongly increases, which leads to a reduction in the efficiency of the entire system. In such cases, the challenge of simultaneous display of images from multiple cameras, for which serve kvadratory, video and multiplexers.
Kvadratory intended for simultaneous output to screen Monitor images from 4 cameras. There are also two-kvadratory to remove the image from 8 cameras to two pages - to 4 cameras each. Typically, the screen monitor, and this is divided into Part 4 (mode "quadro"). However, As a rule, the mutual arrangement images from different cameras can be changed - you can view them in a "picture-in-picture, picture on picture", or alternately in full screen. Most kvadratory are embedded motion sensor, sound alarm in case of loss of signal from the camera.
Video - it's a simple device which allows to transfer an image from a few (usually up to 8) video cameras to monitor alternately with adjustable delay (From 0.5 to 60 sec). Can work in manual mode switch. Some models are supplied with alarming sensors, which by an on-screen image is automatically transmitted to the appropriate area of observation.
1. 
QB-104 - China Black and white, 4-channel kvadrator, real-time authorization 720h576
Price:
$ 50.00 
View the product or service 2. 
CQP-402CHmini - China Color kvadrator; 4 channels; Real Time; 4, 2, 1 picture and PIP; Alarm; Zoom; Freeze; Playback; OSD; display the time and date; PAL - 720h576, NTSC - 720x480; DC 12V/1A; -30 ... +60 deg.
Price:
$ 55.00 View the product or service 3. 
CPQ-802CH - China Color, 8-Channel kvadrator, real-time authorization 768h576
Price:
$ 60.00 View the product or service 
