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This kind of uses battery size term – so named for its lithium ion at a size of 18 mm diameter, 65 mm and cylindrical shape.

Grade Pocket High Lumen 900 Waterproof IPX8 Police with Holster Holder Clip Led CR123A

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5.43 inch , 1 inch diameter (body size); 1.73inch(head),4.51oz; Unique luminous button make you no worry about to find the camping even in

DAX Kit: 2 Rechargeable : High Lumen LED , Super Bright, Zoomable, 5 Modes, Grade, Water Resistant, Batteries, Charger, Gift Box

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

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

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