Of all affordable alternatives ...

on the market, this pump is certainly one of the better times to be reduced the price on Amazon. That the pump can be powered by battery, makes it particularly functional. I use the pump for inflating camping air beds. And this task, the pump can accomplish blameless. The pump can move air and blow out. Whether the pump blow out air or subtracting, unfortunately is not changeable per switch. This works on the basis of the back pressure. Can the air escape without much resistance from the pump, the pump blows out air. Once something back pressure is on the pump hose, the mechanism rotates and the pump draws air from. This means that as soon as the air beds are reasonably full, so come out the air rather than from the bed will go, the mechanism automatically rotates and air is withdrawn. With a little practice, you can tell when the critical time is reached and you have to disconnect the pump. In addition, if you keep to the side of the pump the hand in front of it, you can tell whether air is drawn or expelled.
Regarding the battery, I have been charged not once and had three thick air beds up and pumped out. Whether the included adapter / valves are suitable for every application field, is a matter of luck. With me you did not fit the airbed. I had to think of something and tinker a valve homegrown.
I would recommend this pump with a clear conscience.

Hopefully you can help this review.