CR2032 battery, resistor and 3mm LED holder
thingiverse
Here's the rewritten text: This compact and lightweight coin battery setup, consisting of a CR2032 cell and a small load resistor, is paired with a sturdy 3mm LED holder. The design was conceived specifically for powering 3mm LEDs that are mounted to gourmet caramel-window cookies, which serve as festive holiday decorations.
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