How does Master and controlled outlets sockets work in BR1500GUXI ?

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To conserve electricity, when the device connected to Master Outlet goes into Sleep or Standby mode or turns Off, the Controlled by Master device(s) will shut down as well, saving electricity.
Connect a master device, such as a desktop computer or audio/visual receiver to the Master outlet. Connect peripheral devices such as a printer, speakers, or a scanner to the Controlled by Master outlets