We discuss video recorders DVR/NVR used in camera surveillance systems, their components, features, best manufacturers of these devices like Hikvision, Dahua, Bosch and others.
In this long article we explain the following: what are surveillance systems, what are its main components? camera types and specifications, camera (sensor/lenses) specifications, security camera signal & connectivity, camera housings and more.
WHAT IS A JAMMER?
Jammers are devices that disrupt the normal signal flow of devices such as cellphones, GPS receivers, and even radios. In general, it is very difficult to detect that your phone or GPS signal has been jammed. However, it is easy to see the effects of a signal jamming. When a jammer is in action nearby, you will experience poor signal quality.
Samsung SCD-2021 600TVL Dome CCTV Security Camera