How to use Amazon's Echo Buttons to trigger your Alexa Routines - CNET
Amazon's Echo Buttons can now trigger Alexa Routines - Gearbrain
ECHO AR II TRIGGER – Fostech, Inc.
Amazon.com: BobWire DAT1 Adds a 12V Trigger! Compatible with SONOS Connect, Echo Link, ChromeCast Audio, TV, Anything with an Optical Audio Out. Auto Power On Amplifiers & Fans. NOT Compatible with AV
Amazon Echo setup: the 10 best Alexa tips and tricks | Stuff