Two Yale products appear here, and they are the same viewer in two finishes.
What they are for
Replacing a peephole for somebody who cannot comfortably use one — because of height, because of eyesight, or because leaning against a door with an eye to a lens is not something they want to do. A 3.2-inch screen at a comfortable height solves that.
That is the product. It shows who is outside when you press the button.
What they deliberately do not do
Record. Connect. Notify. There is no app, no account and no network, which means nothing about your doorstep goes anywhere — and for a proportion of buyers that is precisely the reason to choose it over everything else in the hub.
In a catalog where almost every product wants an account, a device that wants nothing is worth having.
The measurement that decides the purchase
Not the door thickness: Yale states doors from 38 to 110 mm (1.5 to 4.3 in), which covers almost every front door. The existing peephole bore decides, and Yale does not publish it. In this hub, the Ring takes holes of 12 to 14 mm (0.47 to 0.55 in) and the Imou 14 to 26 mm (0.55 to 1.02 in); an older 12 mm (0.47 in) hole may need enlarging. On a fire door, altering the bore is a decision to take seriously rather than casually.
The two finishes
Identical products. Choose the one that matches the door: a silver disc at eye height on white vinyl is conspicuous, and conspicuous is rarely what you want on a front door.