Amazon adds a camera to its Echo Studio speaker, upgrades Echo Dot

Amazon has unveiled the Echo Studio with Home Camera, a $249.99 premium speaker with a built-in camera for monitoring rooms, showing things to Alexa and, later, Fire TV video calls. It also adapts sound to the room and adjusts volume as you move. The updated Echo Dot gets Amazon's AZ3 chip, a fourth microphone and a built-in smart home hub.