Hence it is used only to "Charge" a "wireless foot peddle".
From this, it would appear that the "wireless foot peddle" contains a Battery, which needs periodic recharging.
The (vaguely "medical") "appliance" is the "wireless foot peddle".
As far as I can see (from the limited information which has been supplied by ey143 )
when the "wireless foot peddle" is in use,
nothing is connected to the "Mains" - either directly or indirectly.
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