So this is an open-box Ecomax battery, meaning it's basically brand new but might not come in the original retail packaging – still includes all the accessories though, so no worries there.
It's a 20V MAX 2.

0Ah lithium-ion pack with 40Wh capacity, and it's specifically designed to work with your duster gun (you know, those little handheld blowers for electronics and stuff).

The model number is EMA2000-001, so double-check that fits your device.

Made in China, but Ecomax is pretty reliable for affordable replacements.
It's lightweight, charges up nicely, and holds a decent charge for quick cleaning jobs around the house, workshop, or car.

If your old battery is dying or you just need a spare, this is a budget-friendly option that gets the job done.
Just keep in mind it's an open-box deal, so the box might be a little beat up or missing, but the battery itself is in excellent condition – no scratches, no wear.

Perfect for casual use or as a backup.
No fancy frills, but it works, and that's what counts, right?