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Your Price: $0.29
BG Part Number: 1A1495
4N35 6 Pin Dip Opto Isolator 

Probably the most popular isolator ever made

IR LED coupled to an NPN photo transistor.
LED has a Vf of I.15 volts and is rated for 60 ma. maximum current.

Transistor is rated for 150 ma. and a Vceo of 30 vdc.

The base of the transistor is brought out for more flexibility.

Optos are perfect for protecting the output pins of an Arduino or PI when connected to external circuits.

The Captain has stashed thousands of these parts for use during some unspecified, unlikely,  and catastrophic set of worldwide events.
The Captain certainly is a very different type of prepper.