The Ring Drone can follow routes and schedules set by users, or be sent out on demand. Amazon said it is also designed to investigate automatically when a Ring camera, sensor or alarm is triggered. The drone starts at $249.99 and is scheduled to begin shipping to U.S. customers in January. Ring first announced plans for a flying security drone in 2020.

Ring Rover, designed for business security, starts at $999.99 and is scheduled to begin shipping to U.S. customers next month. Both devices are designed to work with Ring’s existing products and app, Amazon said.

Ring founder and chief inventor Jamie Siminoff said the products are intended for places where fixed cameras cannot reach or where people would not want to install them. That, he said, “meant reimagining what a security device could be.” Siminoff added: “That kind of invention is hard, and it takes time.”