Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: I'm looking for something that will help keep the back of my cargo van cool, as the AC alone isn't quite enough.  Will this work?
Document: We sell sweet corn in the summer, and I bought this fan to keep my van cool. Very quiet, but powerful.
I didn't use the battery pack for the fan, but did use it to charge 2 phones twice during the weekend with no problem.3. On the drive home, I left it hanging from the cabinet. The magnet was strong enough - the fan never moved, let alone fell, during a 3-1/2 hour drive, even over rough terrain. It seemed to help a bit more in this position, than in the front of the RV.
I recently purchased the O2 cool portable tent fan with the auto adapter for using on our recent camping trip. My wife and I couldn't have been more pleased with the way this fan worked to keep us cool. I would buy it again if needed. The only thing that would have been great was to have been able to purchase the AC adapter for it as batteries will be expensive when I have to replace them.
It certainly moves enough air to keep one comfortable in a ventilated steel box, which is what my T-shelter is. I really like that I did not have to drill any holes to bolt it to the ceiling.I did not realize that the fan might be used if emergency sleeping in a car, but the cord does have a cig adapter end on it that plugs into whatever power supply you got! Would be handy to run through the back window of my truck when I am using the campershell.
Read all reviews and gave it a shot as it sounded like negatives were user error. The unit worked sometimes when we tried it before a four day camping trip. Couldn't get it to stay on without balancing battery unit and the cord doesn't reach the floor in our tent except in dead center. I know it is the battery part that is the problem as it works fine plugged into our cigarette lighter in the car. Only practical use is to keep our big dogs cool in the back of the Suburban.
Bring plenty of extra batteries. Whatever you decide to bring....double that. It does help stay a little more comfortable and the AC option is a nice touch.
I love this fan. It's not for backpackers and if you're looking for something light, do not buy this... but if you're car camping or just need a fan on a battery pack, this fan is for you. The cord from the battery pack is nice and long (prob 6ft since it goes from the ground to the top of my tent) and then you can hang it from one of the hooks in the tent.
Used it for camping, now I use it in my work van instead of running the van w a/c when Im writing estimates for customers. I think it couldve been a little cheaper in price though
But to attest to excellent customer service, o2 cool actually mailed me a replacement piece. Not too many companies are able to do that anymore, something to think about when comparing this product to one from other companies.
I bought this to use in a classic car that I have that doesn't have air conditioning. I was hoping it would cool the car a bit but It didn't do anything to help with the heat. Maybe my expectations weren't realistic.
Answer: It puts out a lot of air.  The only con I see is it does not oscillate.