Getting this much capable home security hardware for $199 is an absolute bargain (the system became available for purchase today). Adding door/window sensors for $20 each and motion sensors for $30 is an absolute bargain. Paying $10 a month for professional monitoring and video storage in the cloud for an unlimited number of Ring security cameras is an absolute bargain. Ring Alarm will be a huge hit with people looking for a straightforward, easy-to-use home security system.
Sometimes you can't find your doorbell transformer, or it's inaccessible, or the engraving on the side of the transformer has worn off and there is no way inspect the transformer and determine how much voltage it is putting out. In those cases, go ahead and try and install the Ring Pro Doorbell, follow all of the instructions in the Ring app and the worst case scenario is that your Ring doesn't have enough power.  Your Ring doorbell will indicate that it does not have enough power by either not working or once you install it you can go to the settings menu and check the "device health" tab and it will show you the amount of power the doorbell is receiving. . If our Ring Pro Doorbell does not have enough power you will need to upgrade your transformer to one of the two transformers we have recommended above or you can find them at the links below: 
By removing the battery, Ring has been able to make the Ring Video Doorbell Pro a bit slimmer and smaller than its first- and second-generation models. The Pro measures 4.5 inches x 1.85 inches x 0.8 inches (11.4 centimeters x 4.7 centimeters x 2.0 centimeters). That’s 6.7 cubic inches (108 cubic centimeters) versus 13.6 cubic inches (223 cubic centimeters) for the Ring Video Doorbell 2—an impressive reduction in volume of more than half.
This versatile Hampton Bay Door Bell Chime works This versatile Hampton Bay Door Bell Chime works in any home installation. For a Wired installation you'll need a Wired Push Button and a 16 VAC/10 VA Low-Voltage Transformer. To use wirelessly you'll need 3 "C" batteries and a Hampton Bay Wireless Push Button. Replacing your current basic Door Bell ...  More + Product Details Close
The backing plate is designed to mount on wood, brick, concrete, stucco, and aluminum siding, and the kit includes installation parts, like screws and a drill bit, to provide everything you’ll need. Unfortunately, using my cordless DeWalt drill, I couldn’t penetrate my home’s concrete, so I opted for heavy-duty double-sided tape. It works marvelously, and there’s a failsafe even if someone steals the doorbell: Ring will replace stolen doorbells free of charge, as long as you provide a police report.
Ring also doesn't currently offer any additional security accessories, but it plans to add a leak sensor and other devices at some point. And while your Ring security cameras and video doorbells ($150 at Amazon) live in the same app as your Ring Alarm Security Kit, there aren't any direct integrations between them today. I'd like to see something like, "If the Ring Alarm Security Kit's front door sensor notices that the door is opened in Home or Away mode, then tell my Ring Video Doorbell Pro to record automatically" -- even if the Video Doorbell Pro itself hasn't detected motion yet. 
I opened the app, tapped Set Up Device, selected Doorbells, and selected the Pro from the list of choices. I named the device, entered my address (optional), and hit Continue. At this point you can play an instructional video if you're having difficulty. Next I was asked what type of bell my existing doorbell uses (mechanical, digital, none) and was prompted to press and release the button on the side of the Pro, at which point a voice informed me that I was entering setup mode. I hit Continue and was prompted to navigate to my phone's Wi-Fi settings and connect to the Ring network. I returned to the app and selected my home Wi-Fi SSID, entered my password, and waited around 20 seconds before the doorbell was connected. I attached the faceplate and was finished.
Update 1/24/16 - I have found a fantastic use for the Ring Doorbell and Chime. My mother-in-law, now in her 90s, lives by herself. She has become hard-of-hearing and often does not hear the doorbell. By installing the Ring on her door, she now is bothered much less (solicitors tend to recognize it and don't seem to like it) and when someone rings the bell, the Chime, placed by her favorite chair, gives her a better chance of hearing someone at the door.
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