Smart plug

Switches power on and off from an app or on a timer. Some models also measure electricity use. Where those readings are stored depends on the model and settings.

Possible data flows

The exact route depends on the model and its settings. These are common paths, not a claim that every device sends every item listed.

From
Plug
Data
Device state, schedules and any electricity readings supported by the model
To
Phone app or manufacturer's service
From
Phone app or manufacturer's service
Data
Control commands over the connection used by the model
To
Plug

What to know about this device

A smart plug is a networked device just like a camera or television. Check its account, app and update support in the same way.

If the plug measures electricity use, check the instructions for where it stores the readings. Find out whether you can delete the history and whether the feature needs the manufacturer’s service.

Update support matters even for a simple device

The plug’s simple job says nothing about how long it will receive updates. Check the support period before buying and make sure updates can be installed automatically.

A regular timer may be enough

If all you need is a timer, a mechanical one does the same job with no network, app or account.

Settings to check

Check these during setup. Later, make sure device updates continue and the settings still match how you use the device.

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Change the default password on the account the app makes you create
Turn on automatic device updates if the setting is available
Move the device onto the guest network
Turn off the features you do not use
Check what the app asks permission for on your phone
Check when the manufacturer's support ends

Possible data flows

What to know about this device

Update support matters even for a simple device

A regular timer may be enough

Settings to check

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