The Amazon Echo is Bluetooth-enabled and can play music from Amazon Prime Music or other music services. And it's ready to listen to your questions and commands. Amazon.com/AP hide caption

itoggle caption Amazon.com/AP

Employees pack copies of the new book Harry Potter and the Deathly Hallows for shipment in July 2007 at an Amazon fulfillment center in Fernley, Nev. Workers at the center filed a suit in 2013, seeking compensation for time spent in a mandatory security line after their shifts. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images