I moved from the city to the cabin...I had ring in the city....a ring door bell with an in house chime costs $150. I also subscribed to ring, maybe $60/yr. requires WiFi.

at the cabin,I have blink...not a door bell, but a security camera when I am away. Requirements WiFi

my brother and a neighbor has arlo.

Thanks Jim. Did you like Ring? I was concerned about privacy?

What do you want the system to do? I bought an old townhouse that had an inoperable intercom system that allowed someone on the second or third floor to speak with a visitor at the front door (first floor) and press a button to unlock that door. Do you want the new system to replicate this or offer other features? Is there a doorbell? What's its status?

Previous owners had someone try to fix the system. Unfortunately, they ripped the door release out of the jam and I no longer have a doorbell. I am in the process of replacing door and jam and considered trying to install new door release. I thought I really would like to see video as well but think that might be two separate products? Also, who do you call to install electrian or home stereo installers?

1. For a video doorbell, you may want to try the Ring Video Doorbell 2020 release (pcmag review). If the old doorbell wiring is available, you can connect the Ring doorbell to it to keep the battery charged. Otherwise, you have to periodically charge the battery. An accessory Ring Chime is available.
2. If you door has a peephole, you can replace it with the Ring Peephole Cam (pcmag review). It uses a removable, rechargeable battery.
3. The old electric door locks used a solenoid embedded in the jam that shoved a bolt into the door. Those have been replaced by "smart locks" which control a deadbolt and lock the door in the normal way, from the door side. If you have a functioning deadbolt, you may want to try the Wyze Lock (pcmag review) which attaches to and turns the existing deadbolt to lock and unlock the door.
4. PC Mag's The Best Smart Locks for 2020.

I'm a cheapie. There are lots of other video doorbells and locks

Some notes on the Ring: You can install it where there is no power available, but you'll need to take the battery out from time to time and recharge it. If you have some existing wiring you can use to feed "doorbell" level voltages to, it will run "forever" without recharging.

The Ring will also short the contacts together to trip an existing traditional doorbell if you have one.

The Ring (other than simulating a doorbell button) does ABSOLUTELY SQUAT AND IS BY AND LARGE NON FUNCTIONAL unless you have an active internet connection with at least 1 mb/s UPLOAD performance. Mine is quite iffy with my crappy CenturyLink 1.5M up bonded DSL.

Thank you for your responses! I will look into your suggestions.