Power: AA battery (Not included) The reciprocating frequency can reach 3100-3600 times per minute, improving polishing efficiency and saving time. Equipped with a dual-function switch for forward/reverse action and quick lock-on functionality, allowing you to easily switch between sanding . perfect: Shaping Body Filler, Removing Paint, Rough Edging, Primer/Metal Sanding, Hobby working..etc.. Provides Exceptional Sanding Performance, so you can get the fast, saving you time and money., Manufacturer: Akfldms