Amazon Echo - Alexa Voice Service - Amazon.co.uk

Echo has seven microphones and beam-forming technology so it can hear you from across the room--even in noisy environments or while playing music. Echo is also an expertly tuned speaker that can fill any room with 360 immersive sound. When you want to use Echo, just say the wake word "Alexa" and Echo responds. If you have more than one Echo or Echo Dot, Alexa responds intelligently from the device you're closest to with ESP (Echo Spatial Perception). ESP works best when Echo devices are at least 6 metres apart.