2nd Gen Ring Video Doorbell. This is not only a video doorbell but it records motion as well.
You don't have to hardwire this video doorbell which is perfect for renters. If you want to go back and see motion and video, you can subscribe to their cloud service for only $30 a year.
I've had both the 1st gen and 2nd gen doorbells and loved them, but I like that the 2nd gen has a removable battery which lasts for quite a while, but dependent on your motion settings.