Toyota 2013 Prius Owner's Manual page 133

1-3. Key information
Key number plate
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Keep the plate in a safe place such as your wallet, not in the vehicle. In the
event that a mechanical key is lost, a new key can be made at your Toyota
dealer using the key number plate. (→P. 590)
When riding in an aircraft
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When bringing an electronic key onto an aircraft, make sure you do not
press any buttons on the electronic key while inside the aircraft cabin. If you
are carrying an electronic key in your bag etc., ensure that the buttons are
not likely to be pressed accidentally. Pressing a button may cause the elec-
tronic key to emit radio waves that could interfere with the operation of the
aircraft.
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PRIUS PHV_OM_OM47787U_(U)