Israel’s Rubidium has integrated its voice trigger into the 66 Audio® PRO Voice wireless headphones, to produce the world’s first voice-triggered Bluetooth headphones with built-in Amazon Alexa. Users say “Alexa” to start interacting with Amazon’s cloud-based voice service.
http://www.rubidium.com/rubidium-powers-the-first-voice-triggered-headphones-with-alexa-interface/