Meet Alexa, the voice behind Amazon Echo speaker
Meet Alexa, the voice behind the interactive Amazon Echo speaker. Alexa is a voice controlled personal assistant. Unlike Apple's Siri, Microsoft's Cortana, and Google Now, it has a physical presence. It is 20 cm-tall black cylinder, which contains Wi-Fi, two speakers, seven microphones, and connects to the cloud. Pringles-can-sized Echo costs around $200.