Does it come with a battery and charger?

No. It is sold as the tool only, so you need Makita 18V LXT batteries and a charger, which are sold separately.

What size blade does it take?

It uses a compact blade sized for a cordless miter saw, smaller than a full-size 10-inch or 12-inch corded saw. Check the tool's spec for the exact blade diameter before buying a replacement.

Can it cut through 2x4 lumber?

Yes, it handles common 2x4 crosscuts and miters. Deep cuts in thick or dense stock may need two passes or a larger corded saw.

Is it good for trim work?

Yes. It is light enough to carry room to room and makes clean crosscuts and miters in trim. Long runs of cutting will drain batteries, so keep spares charged.

How does it compare with a corded miter saw?

It is more portable and needs no outlet, but a corded saw has more power and a larger blade for big stock. Choose cordless for mobility, corded for heavy cutting.

Why does the listing carry a California Prop 65 warning?

The warning notes exposure to chemicals known to California to cause cancer and birth defects or other reproductive harm. Follow the handling and dust precautions in the manual.