Voltage measurement not displayed

  • I've both "Shelly Plug S" and "Shelly Plus Plug S" devices.
    As visible in the image below, the first one only displays the current power and the second displays current power + voltage.
    I can't find any mention to such difference in the technical specs of these two plug types.

    Is it really the expected behaviour, or am I doing something wrong in the app?

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    Fernando