Enjoy superior image quality courtesy of the 4MP Enjoy superior image quality courtesy of the 4MP sensor delivering twice the resolution of 1080p for stunning clarity. Wide Dynamic Range enriches your image quality with deep blacks contrasted whites and vivid colors so images appear true to life. Infrared LED's give you up to 100 ft. of night vision ...  More + Product Details Close

Ring offers a wide variety of doorbell and exterior security lighting features that range in price from $99.99 to $499.00, as well as plenty of accessories for them that range in price from $10.00 to $49.00. These accessories include options such as a solar panel, ring chime, quick release battery pack and more. And, they have two monthly video recording packages that range from $3.00 per month ($30 annually) to $10.00 per month ($100 annually).
The Ring Alarm starter kit is one of the most affordable security systems available. For $200, you get a wireless base station, a keypad for arming and disarming the system, one entry sensor, one motion sensor and a Z-wave range extender. I would have liked the kit to include at least two entry sensors since there's typically more than one point of entry to every dwelling, but you can purchase additional entry sensors for $20 a piece.
By purchasing this system you’re almost certain that they will come out with upgrades and updates to this product and ways to integrate it with Alexa and smart home devices. If you encounter any kind of issues, they will have someone listen to you and actually give you a solution rather than one of these knock off Chinese products that will give you excuses for faulty behavior but not solutions.
If you unscrew your old doorbell you will see that there are two wires running to it and two terminals. You can take a multi-meter and measure the voltage across the two terminals. If it reads  in the range of 16V-24V you most likely have enough power for your Ring Doorbell Pro, but you sill need to check the amperage. We recommend the multi-meter below because it is the simplest to use without extensive knowledge of electrical workings. It has auto-ranging meaning you only need to turn the multimeter to the correct dial and it will tell what the voltage is. The correct "dial" setting to measure voltage is the "V" with the lines on top.  Even if your voltage is reading 16V you still need to check that you have 30VA of amperage from the transformer as this is the recommended amperage requirements from the manufacturer of the Ring Pro Doorbell. 
Never wonder who’s knocking at your door again. With the Ring Doorbell, you’ll receive alerts when your doorbell is pressed or motion is detected, allowing you to hear and interact with visitors. In addition to acting as a two-way communication device for your front door, it works as a security system; you can set motion detection zones from five to 30 feet outside your door. The sensor is quite sensitive, so it’s probably best to set its range and awareness levels as low as you’re comfortable with. If you’re willing to venture off Amazon (and pay a little more), the Nest Hello doorbell is another favorite option that works with Alexa.
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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