[fintstone]

I did not want to run any wires that might limit my flexibility (I move them around). The Blink units have a small transmitter that must be within range of wifi and the cameras must be in rage of the transmitter. That gives a bit of extra range if placed properly. You can put multiple cameras on each transmitter or one. I have mine set up with a group on outside, one on inside, or upstairs, downstairs, garage, etc... depending on home (so I can turn the motion sensors off in some areas and not others. The wireless cameras use 2 AA lithium cells (I use energizer) that last over 2 years for me. I generally use the wired ones where I can because they are much cheaper to buy initially. They only come on when triggered by motion or when I intentionally trigger them from my Iphone.