Each piece of Ring's kit is designed to protect a different part of your house. The contact sensors detect when windows and doors are opened or closed; the motion detectors use infrared beams to sense movement and heat in a room; the keypad lets you arm and disarm the system; the base station keeps the system online, and has a 110-decibel siren that sounds when motion is detected; and the range extender keeps the sensors connected to the base station. Both the base station and range extender have a 24-hour battery backup that will keep the system online in case of a power outage.
Whatever connection your doorbell ends up using, Ring recommends having a broadband upload speed of at least 1Mbps, with 2Mbps preferred. That’s typically not a problem with cable modems, but it can present a challenge to DSL gateways. The video doorbell won’t use this uplink connection all the time, it’s active only while you’re streaming video or when its motion detection triggers video capture that’s uploaded to the cloud.
3 - If you do not answer the alert fast enough, you are locked out-- even though someone is standing at your front door. You cannot "turn on" the camera from your phone or tablet. If someone is there and you do not have an "ACCEPT" button on the screen, there is just no way to see or talk to them. This is obviously a software flaw. You should always be able to "wake" a camera remotely and talk to a person at your front door. Or maybe you just want to see the view outside your front door. You should be able to access the camera / microphone and enjoy your front yard.