They are so good I became exclusive distributor in Germany where I come from and because they are the only locks that have a keypad, cloud smart phone access, and very importantly, when all goes wrong, a key.

It took me a while to move past savings accounts ("earn interest on the interest") to stocks ("they can go down as well as up" [my parents grew up during The Great Depression]), but I had to start somewhere.One of my neighbors told me she has an app on her pre-teen son's smartphone that sends him daily emails about his savings account.

Smartphones and social media we just in the early stages and it people did not know how or where to find the value of their home.

They are full color photos of the house on both sides and they send from your smartphone!

@Wade Alderson Just manage it yourself all you need is a smart phone.

For example, do you have any favorite...phone apps (chat, photo, listings, calculator apps), online services (answering services, screening, listings, signing, rent), or hardware (which smart phones, cameras, door bells, voice controls, 3d walkthroughs, lockboxes or smart locks, wifi services, tv, etc)Full disclosure...

If the market falls, all we have to do is hit the sell button on my smartphone.

I have buddy grew up in the Northside, he says the foot traffic/drug dealers are less of an issue since the dawn of smart phone and apps.

@William GravesBefore walking a house, I estimate using rough $/sqft from previous experience.If that gets me near a purchase price that I think can be negotiated, then I'll go visit the property.Generally when I first walk through the property I estimate by taking notes on this spreadsheet:https://www.biggerpockets.com/files/user/kubaf/fil...While I'm there I am also using my smartphone to record the entire walkthrough, because I always refer to that video later during itemization.Then I go back and rerun my numbers.If the numbers are still in the ballpark I'll make the offer.If the offer is accepted, at that point as part of the property due diligence I will then spend the time to itemize the rehab costs and solicit bids based on the itemized scope of work.

On a typical longer-term residential rental home, a smart phone will work great.