Ring has a new flagship in its consumer video doorbell line: The Ring Battery Doorbell Pro delivers the company’s vaunted radar-based 3D motion detection to homes that don’t already have low-voltage wiring in their walls. Ring’s Birds Eye View technology provides an aerial perspective that allows the homeowner to track the path a visitor took to their door, and it can be programmed so that alerts are sent only when motion is detected in a precisely mapped range. In our evaluations of other radar-based Ring cameras, we’ve found that the ability to restrict the range of motion detection to be us…