No worse than your TV on standby.
They use fractions of a watt and just check in often enough to see if there’s anything they need to respond to.
Low power wifi, Bluetooth LTE, etc. consume almost nothing.
For reference, if it uses even 1W of power, you’d need to have it on for 1000 hours (41.7 days) straight for it to use even a single unit of electricity (KWh, about 10-20c in the US at the moment).
Say you had ten such devices, it’d barely cost you a dollar a month to have them all on 24/7.
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