According to Pearsall, Echo is a free-standing speaker that’s connected to a internet. It’s always on, and always listening for a “wake word” that activates a device. Once a arise word is spoken, a practical partner can respond to voice commands and yield information on news, weather, song and more.

Article source: http://www.huffingtonpost.com/2016/12/28/amazon-arkansas-murder-case_n_13875214.html?utm_hp_ref=technology&ir=Technology