Amazon to buy Ring, maker of Wi-Fi--connected doorbells

NEW YORK (AP) - Amazon is expanding its home-security business by buying Ring, which makes Wi-Fi-connected cameras and doorbells.The deal comes months after the online retailer started selling its own Wi-Fi-connected indoor security cameras, which work with its voice-assistant Alexa. The Ring acquisition helps Amazon better compete with Google's Nest, which also makes cameras.Ring's doorbells and cameras capture video that can be streamed on smartphones and other devices.