I can see the advantage of sheer cutting tool with the multiple angles, I think I will add these to my tool bag. https://www.idealtruevalue.com...I also recently bought the below wet/dry vacuum, the tool has the capability to be 120V or be battery powered if power isn't available.

Of course, there are other openers for sale — electric countertop versions, battery-operated ones that can fit into a drawer — but as reviews show, they all come with their own set of drawbacks: dropping cans onto the counter, using more battery power than expected, just not working, and impossible to fix yourself.

Probably not battery operated but hard wired.

Electronic Lifts- disconnect the battery if leavingfor long term storage.K.

Try to get a maintenance report as you would do for your HVAC system.Does the system have Batteries?

This is what I do   So far so good Battery operated Fake security cameras,  With blinking red light  1 on each corner.  

They are battery operated, you may have seen them in restrooms. 

But he did leave a LOT of neat gardening tools, a battery charger, gas lawn mower, outdoor patio furniture, 5yr old propane BBQ so our new tenants were real happy.

It looks like a "ring base station" is required to make these work, not sure if there is a work around, and also wondering if you'd need your own dedicated wifi in the house to connect all this too Owning a few properties myself and as a property manager for other investors I am imagining now the calls I would be getting when this system isn't working properly, batteries die, motorized lock stops working etc, so living in new england with the elements and temperatures we experience I would not recommend this to the owners of the properties I manage I have an up down style 2 family with a common entry door that sounds very similar to your setup.

Article highlights:“Tesla recently purchased 381 acres adjacent to its existing 2,100-acre site at Harold Green Road and Texas 130, deed records show.Tesla also is believed to be pursuing additional land purchases in Southeast Austin along the Texas 130 corridor, according to local real estate developers knowledgeable about the area.A battery-making operation also could be a possibility, as well as a test-driving area, analysts have said.