If I could give it a negative star, I would. I had to repair this pump before I could even use it the first time. And the second time, forget it. The metal bands can't be tightened enough to prevent air leaking out around them. Poorly made. 1 star

I bought this last summer to keep on our boat. Unfortunately, we didn't try it out until after the 30 day return period had already passed. We tried to blow up a large tube with it, and after 10 minutes there was barely no air in it at all. Our boating friends tossed their powered pump across the water to us, and in just a couple of minutes, the tube inflated properly.

I guess we'll give this one more try next summer when boating season starts. If it's as bad as before, it's going in the trash. 1 star

we have one of those battery powered pumps and it's not half as good as this thing! with this, you can get the air mattress really full and firm and it makes leakage negligible. the only con is the size: it's rather bulky, about the size of a dinner plate. 4 stars