w/today's tech, you can easily qualify/quantify the effectiveness of your medium by use of link tracking / web analytics and ph# tracking ... that's the only way you'll truly know which medium is working best for you or at least how effective they are for people getting back to you.btw, i say menu items (i.e., restaurants - if ppl want to know nutritional data, origin, price, reviews, etc.) or products (i.e., similar to restaurants if you're at a grocery/food place OR for mfr data, reviews, coupons, rebates, price check, etc.)... note that above mentioned uses are typically where you're not in a car or getting a single letter/post card that you're reading (and you have to pull out your phone just to scan the qr code vs. typing in a url or ph# just to call/get more info).

Ring central doesn't provide analytics so it is more of a voicemailbox system like google voice with more features. 

A good vendor will help you get the proper camera for each location...they have various focal lengths, day/night capabilities, license plate readers, and analytics (that can automatically send you an email when an area is entered during a specified period, such as late night, great for catching trespassers) that are pretty easy to configure for common needs.They do not come cheap, but OTOH they give you eyes 24/7/365 and are generally very low maintenance.

Very importantly their in-house property management is superb.   

My current tenants were charged with felony drug possession and since they reside in my condo and signed a Crime Free Housing Addendum, I need to finish their tenancy.Up until this recent event, and during the few years they lived at the condo, these tenants have been superb.

If you're interested in learning more- I do a lot of analytics that might be able to help you find something.

Im not knockin absentees but its a game thats been played out and most owners, will tell you i get these letters every week....I dont feel the competitive stress, because most of the time im not competing against anyone but myself, and the fight is me sealing the deal....What im saying may sound like jibberish to you now, but it will sink in and you'll find yourself in a pocket of your own....All this analytical thinking is a time waster, just get out there and find out how to go against the competition.

I know a lot of brokerages use Black Knight, Corelogic, Attom, and a couple other data providers for property information, listings, safety, weather, AVMs, other property financials, and analytics around predictors for mortgage rates, risk assessments, etc.

I love how analytical you are with the deals, and also the time you take reviewing and understanding the deals.

The wealth of knowledge that can be found on BP is superb - definitely surf around the forums, blog posts, and the books to gain information.