I recently received my $65 doorbell + batteries + chime ordered of aliexpress
I installed using my iphone 7 plus as the viewer I suppose you would call it. Found the app through supplied qr code
setup less than 5 minutes no seriously!
So not making any money of this or affiliated etc but I feel I can recommend as a good unit amongst the thousands on aliexpress.
If anything its only 2 faults would be cant view image on my apple watch and same goes for my alexa
but $65 NZD !!
oh ps you will find a middle of the night outside pic no lights on porch