NEW YORK (AP) — Online juggernaut Amazon Inc. unveiled its next generation of Kindle, Ring and Echo devices, among other gadgets, that are all powered by artificial intelligence and connected to Alexa+, its AI-infused personal assistant, which made its debut in February. Amazon unveiled four new Echo devices revamped with Alexa+ that serve up personalized insights like whether the user left the front door unlocked after midnight. Amazon said the ring cameras with retinal vision now come with 2K resolution for sharper detail and 4K resolution video. An updated lineup of Kindle Scribes:Amazon unveiled new versions of the Kindle Scribe that the company touts as lighter and faster and features an AI-powered notebook search. The company said that all four new Echo devices are available for pre-order starting Tuesday.