Ring also introduced the $1,000 Ring Rover Cam, a repurposed spin on Amazon’s earlier Astro robot that’s now dedicated to autonomous security. The device, which ships in mid-December, streams. Amazon’s Ring unveiled the Ring Drone Cam, a $249.99 flying indoor security camera, and the Ring Rover Cam, a $999.99 patrol robot for businesses, trying again with two ideas that stalled at Amazon.