The Remo+ DoorCam 2 is an over-the-door security camera for people who can’t or don’t want to install a fixed video doorbell.

It’s a good option for renters, and offers many of the functions of a video doorbell, except it’s missing a key feature: a doorbell function. That’s not a criticism, but you should keep it in mind when buying.
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https://www.techhive.com/article/3586612/remo-doorcam-2-review.html