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Yes. You can get 3-5V mechanical or solid state relays with keyfob remotes.  I’ve even wired one into a mando style fob.


You still want to flip a physical power switch, or unplug when not in use. The wireless circuit will drain your battery after a few weeks/months of storage.


Portable USB power packs are what I recommend to folks for power.  Easily swappable, rechargeable, pluggable.


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