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Though Videotelephony is seldom called 'CCTV' one exception is the use of video in distance education, where it is an important tool. In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing digital video recorders DVRs, provides recording for possibly many years, with a variety of quality and performance options and extra features such as motion detection and email alerts. More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, support recording directly to network attached storage devices, or internal flash for completely stand alone operation. The earliest video surveillance systems involved constant monitoring because there was no way to record and store information.security systems for home wireless
To view a live stream, tap Watch Live to wake the doorbell up. Once awake, you'll see live video that you can view in full screen mode by turning your phone sideways. Tap the microphone button to initiate two way audio and the X button to return to the previous screen. There are four buttons at the bottom of the screen. The Camera button takes you back to the home screen, and the Activity button takes you to a screen with thumbnails for all recorded events. Tap any thumbnail to play the video or download it to your phone. There's also a Guest List button that you can use to invite other users to access the app and videos, and a Settings button that brings you to a settings screen for all installed devices. Tap the doorbell button to manage notifications, enable/disable doorbell sounds, adjust two way audio volume, change Wi Fi settings, and check the doorbell's battery status. By default the View uses the same Wi Fi as your phone, so all you have to do is enter your password, but you can choose to connect to another network. After 45 seconds or so the doorbell came online. At this point, you can view instructions for mounting the doorbell, or skip it if you already know how to do this.