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Form/Size Factor. All Medium size (Permanent Marker) Small size (Car / Zippo ).

Underwater USD507366(s).

https://www.snagshout.com/offers/led-headlamp-flashlight-cree-t6-batteries/d4b5bd

https://en.wikipedia.org/wiki/Headlamp

https://en.wikipedia.org/wiki/Headlamp_(outdoor)

https://en.wikipedia.org/wiki/Headlamp_washer

Amazon.com: key flashlights

key flashlight | eBay