If the cameras' PIR motion sensing is enabled, they'll alert the Sync Module over LFR when they're triggered, and the Sync Module will pass along the operating status to “cloud” servers to prepare them to capture the incoming video clip. And the cameras, which claim up-to-2 year operating life out of a set of two AA lithium batteries, are normally in low-power standby mode.
The Sync Module also connects to the router over Wi-Fi. In summary (see the blog post for more product details) each of the cameras in a particular network implementation connects not only the common LAN/WAN router over Wi-Fi, but also to a separate and common piece of hardware, the Sync Module, over a proprietary long-range 900 MHz channel that Blink refers to as the LFR (low-frequency radio) beacon. One of my recent blog posts gave an overview of the unique (at least to me) architecture of Blink's consumer security camera system.
