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Begin with the receiver and the number of rooms you must follow at once. A supported camera count is not the same as simultaneous pictures, and a split display is not proof that two room sounds are both available. Optional limits let you ask for a minimum screen, published open-space range, included camera count or manual-stated screen-on runtime.
For the local Infant Optics systems reviewed here, the parent unit receives a direct camera radio link. They do not provide away-from-home phone viewing. The finder treats an unknown value—such as the PRO SS runtime—as unknown instead of guessing from another model.