about the quick 'n easy pin:

If you do not have much time and want to make an (in)visible pin quickly, follow these directions.
This assembly requires no sewing, but the end result is not very durable and requires careful handling.

Materials: 1 infrared LED, 1 3-volt battery, 1 battery holder, strip of felt or fabric and safety pin. (See
the resources page for retailer suggestions.)

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