Knowledgebase
| Word | Description |
| Varifocal Lens | A camera lens in which the focus is not fixed, it can be manually or automatically adjusted. |
| VCR | Videocassette recorder; an electronic device for recording and playing back video images and sound on a videocassette. |
| Video Capture Card | Computer cards that you can install on the motherboard of your own computer to create your own video recording computer. Due to compatibility issues with this type of device, we do not sell these separately. |
| Video Gain | An increase in video signal power by an amplifier, expressed as the ratio of output to input. Also called amplification. |
| Video Input | A connection in a video controller or recording device that you can plug a camera into. The more video inputs (also called camera inputs) available on a device the more cameras you can connect to it. |
| Voice Dialer | A device that will automatically call pre-programmed telephone numbers, and play a recorded voice message that a human listener can understand, when triggered by the alarm system. It’s usually an add-on device, but a small number of systems have this function built in. |
