What is the Extension barrel for? There's no information about it in the product description or in the instructions.

Hello, You can get a longer flashlight by unscrewing the tail cap and attaching it to the extension barrel (if you like and need it). When using the extension barrel, it needs to be powered by 3 batteries at the same time (we provide two batteries and please replenish one 3.7V-4.2V battery), and has longer runtime.

Where does the positive side of the battery goes ?

Hello, the positive side of the battery goes towards the end where the light shines.

Is this considered a Long wave UV similar to lights from yooperlites? I'm planning on using this for fluorescent rock hunting and need a long wave UV

Hello, The wavelength of this UV light is 365-370nm, which is a long-wave UV light for your reference.

Can it use 14500 lithium cells?

Yes, it can, you can use your 14500 lithium cell (not included in the package) with the voltage within 3.7V. The unit will comes with Non-rechargeable AA battery. Hope it helps.

Manufacturer	DARKBEAM
Item model number	B30 Pro Max
Product Dimensions	22.61 x 5.59 x 3.05 cm; 449.06 g
ASIN	B0BGN9CP76

DARKBEAM Blacklight UV Flashlight 365nm Wood’s lamp, Rechargeable 36W Powerful Portable Handheld, 3-LED Ultraviolet Black Light pet Urine Detector for Resin Curing, Minerals, Leak Detection

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