We'd like to get a video doorbell, as we often don't hear people knocking from the back of the house, plus we can't see through the obscure glass even if we're beside the door. 

Here's what I think we need:

• Battery or mains powered
• Works with either Android phones / Amazon Echo Show 8 device
• Water resistant - noting that it will rarely get wet because it's a sheltered area

What have people found good? Ideally based on personal experience.

Update Nov 2022 - I've asked a question about the Amazon Blink devices, also removed the requirement for battery because I've worked out how to get power to it.