Amazon is currently discounting the Echo Dot and Ring Video Doorbell 2 bundle, bringing it down to $199. Separately, this bundle would cost you around $249. So you're saving $50 here, or another way to look at it, is you are getting the Ring Video Doorbell 2 at its regular price and getting a free Echo Dot here. Definitely a good deal if you're looking for a smart doorbell.
The Ring Video Doorbell 2 is a great smart doorbell to pick up. It is a good looking doorbell and it does have a camera built-in as you might expect. Additionally, the Ring Video Doorbell 2 is able to let you know when someone is at your door, so you can see who it is, without going to the door. There is also two-way audio here, so you are able to talk to the person at your door, perhaps tell the FedEx driver to put your package under a chair on your porch or something. It also lets you know when someone comes to the door and doesn't ring the doorbell. This is great for knowing when your kids get home from school, while you are still at work. With the Echo Dot, you get Alexa support, which you can set to ring when someone rings the doorbell, and of course, you can do many other things with Amazon Alexa.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $119/year (or $59/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.