They have something like 40-50% of the US smart phone market. 

Does anyone have a recommendation for a rental management app?

Yes, Uber, Lyft, Tesla, Amazon, several smart phone companies, AI, Nest, Visa... and tens 1,000 of these companies are all here.

Everyone has a smart phone and there are plenty of ways to connect face to face or face to property in real time.

Plus the mat should help keep the house clean during showings.I should of mentioned that the security system is a one time expense of about $75, doesn’t require monthly payments, it simply sincs to your smartphone and nothing else.

They were nifty 10 years ago but with the advent of smart phones and online web portals, they don't offer nearly enough in my eyes to justify the cost. 

However, some of that work is work you can mostly do from a smartphone lying on a beach.

School, for some, was the only possible education.Today, if you have a smartphone or access to the internet, it's almost free.There have always been bookstores and libraries if course, but never had so much info been literally in the palm of our hand.It's a double edge said sword, though, because with that information we naturally have a lot of bad info to decipher or sift through.

And if they're just a little tech-savvy, they can import your booking calendar to their smart phone and see your entire schedule at a glance.  

Or the ones who can't ever pay rent on time, yet have expensive smartphones, enjoy the deluxe cable TV package, and drive fancy late-model cars?