A tool/machine with a higher voltage produces more power.
A drill with variable speed allows you to switch between low and high speeds, giving you the possibility to take on a wider range of tasks.
Higher speeds work better for drilling holes in certain types of material, such as steel, aluminium, concrete, etc. The drill speed is measured in rotations per minute (rpm) when the drill has no-load.
The amperage is the strength of an electric current, and it is measured in amperes (amps).
The hammering action provides short, rapid hammer thrusts that make drilling faster and easier. The hammering action is measured in blows/beats per minute (bpm) when the drill has no-load.