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As already stated they are designed to be left on but they go into a lower power use mode after 3 minutes of no signal more info about the power use is here https://sonos.custhelp.com/app/answers/detail/a_id/260/kw/standby/session/L3RpbWUvMTM5MjU3MDgwMC9zaWQvQUk4Sk80Tmw%3D?_ga=2.268741049.958788061.1524735305-1903152627.1415180568