This item is a manual two-way air pump. 

Double Action Technology: Inflates on both the upward and downward strokes for faster inflation. 

Included Accessories: Comes with 3 different nozzles/valves to fit various inflatable items. 

Versatile Use: Suitable for inflating air mattresses, swimming pools, pool toys, and exercise balls. 

Portable: Compact design allows for easy travel and use away from power sources