Cordless Polisher Pro II

This tool requires 2 AAA batteries

Includes two hard plastic pads - one flat the other with a curve

From the manufacturer:

This tool operates with a reciprocating movement; you can use the waterproof paper head for sanding or rubbing back joints, or use the sponge head for polishing. Operation speed is adjustable between 2 steps, so you can choose the speed suited to your work. Work efficiency is improved due to the improved torque compared with the existing tools.