What do the four modes do?

The selector changes the wrench's output and control settings, letting you run lower power for small fasteners and full power for lug nuts. It is the main feature that separates this from single-speed compact wrenches.

Does it come with a battery and charger?

The listing shows the wrench and its original box with the originally boxed contents included. Confirm whether a battery and charger are among those contents before buying if you do not already own Hercules 20V packs.

Will it remove lug nuts?

It is a 1/2-inch impact wrench built for automotive fasteners, so lug nuts are within its intended use. As a compact model it has less peak torque than full-size wrenches, so heavily seized or over-torqued nuts may need a larger tool.

Does it use the same batteries as other Hercules tools?

Yes. It runs on the Hercules 20V battery platform, so packs from other Hercules 20V tools fit it.

It has a 1/2-inch square anvil, so standard 1/2-inch drive impact sockets fit. Use impact-rated sockets rather than chrome hand sockets.

Is it good for a professional shop?

It is aimed at home and light-duty work. A shop doing repeated heavy fastening all day would be better served by a full-size, higher-torque cordless or air wrench.