I would just add that there are some that will also send an alarm to your smart phone. 

Remember, when looking at these properties, don't close your eyes or bury your head into your smartphone on the way there (assuming somebody else is driving).

It helps me make much better financial decisions; smart phone at $180/month doesn't sound so bad. $2,160/year just so you can post pictures of your lunch to Facebook starts to sound a lot more stupid.

If you have a smart phone buy the 10Bii app, it's a financial calculator that works really well.

It will help with your quality of tenant, they can remotely login via smartphone, but it also allow you to keep a pulse of whats happening on the property.

The property inspection module alone is well worth the price, with the ability to do inspections, take photos, assign property conditions to each room and take notes, all on your smart phone which then synchs to the desktop. 

The connections or negotiation skills you have to buy a property off market or at a lower price then everybody else is a competitive advantage.An everyday example of product differentiation vs competitive advantage is the highly contested smart phone market. 

Control it from your smart phone.

There's a lot of us, and a lot of old school investors, just doing deals and not spending all of our time texting on our smart phones.

Based on those answers you can decide if you want to set up a showing with them.Before we talk about streamlining showings, I want to share a hack with you during the initial screening phase.Prepare templated questions in advance to streamline the process and utilize text replacement features on your smartphone for efficiency.