Since the Security Kit only comes with one detector and one sensor, you’ll likely need to invest in more sensors if you’re looking to cover any space with multiple access points. The advantage of the Ring contact sensors is that they work on both doors and windows, meaning you can easily swap them from one location to another as you configure your set-up. When triggered, the sensors will send instant alerts to your phone, letting you react in real time. While a little bigger than traditional sensors, these come in a bright white color, blending in with most door and window frames.
But those were only best-case scenarios. Throughout real-world testing with visiting strangers as well as staged testing with friends, I oftentimes experienced very long latencies between the button press and a phone notification. Sometimes the lag would last up to three or four seconds. And sometimes I wouldn’t receive any smartphone notification at all. Case in point: the hapless pizza delivery guy who pressed the Ring button two times before giving up, and calling my phone.
Most people don't have their wifi routers right near the front door so it can be a challenge getting a strong wifi signal to the Ring Doorbell. The other challenge is that the wifi signal must extend beyond the inside of the house and through building materials like bricks, siding, insulation and wood. So even if you have a strong signal inside your house it doesn't mean that your going to have a strong wifi signal outside your home. 
Even if you experience a power outage, both security systems will continue to work thanks to cellular connectivity. This feature is available from Nest for an additional $5 per month or $50 for the year. Ring includes this feature as part of their Protect Plus plan. Nest’s backup battery will last for 12 hours, while Ring’s will last for 24. With a longer battery life and an included cost, Ring is the clear winner here.
With the Ring Video Doorbell Pro, I managed to almost eliminate false alarms, so that just about the only thing that set off an alert was an actual person at my front door. I occasionally got an evening alert when a car with exceptionally strong headlights went by—I presume because it illuminated the lawn and that was interpreted as movement—but the level was much lower.

The Ring Doorbell Camera security system was acquired by Amazon. They currently offer doorbell cameras and exterior security lighting cameras. And according to their website product page, Ring will soon be adding indoor security and environmental protection products to their lineup as well. This is great news based on how popular their current products have become.

2 - This kind of goes along with #2. You cannot access the doorbell with security software like Blue Iris,et.al. Now, I get that they want to sell you their Cloud service and I'm ok with $30 / year to have an off-site backup. But if you could link the doorbell into your security system you would have an actual video of everything in your possession and you could access it from any computer in the world. That would be REALLY handy for police investigations and any legal hassles that may come your way.
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