Instruction: Generate an answer to the question by utilizing the information contained in the document.

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Question: How am I supposed to tell if the fans are on? I don't see anything spinning and I don't hear anything but my laptop seems to be cooled a bit?
Document: I have had this now for over a year and it is an excellent cooling fan. It is very quiet. I can't hear it over my normal sound of my laptop running. I have a 17 inch Asus G72GX and this fan keeps it very cool and allows for extended gaming without any overheating at all. If anything the blue LED light seems pointless (at least with a laptop of my size) as I can't see it at all while gaming.
I think buying this cooling pad was worth it. My other one was louder and made weird sounds sometimes, but cooled just a little bit more. This one is silent and still keeps it decently cool. I like the feature of the on/off switch and the extra usb port. You can't really see the blue led's with the laptop on top, but it is a nice addition. Overall I think its a great cooling pad and perfect for people who are always on their laptop.
My laptop sits on it fine. I have a 13.3&#34; inch ultrabook so it's a little smaller than most models. The items looks great. The LED light is helpful to let you that it is on. Other than that, you'll wonder if it's doing anything. I can hear it sometimes but honestly there is NOT sufficient airflow from the fan. So I remove the laptop. I see the fan moving. I feel no air with my hand.
This cooling fan is awesome!I've had other fans before that were made of cheap plastic and this thing blows all of them out of the water! Its sleek, stylish and amazingly quiet! I can barely hear anything. It's also very well made, sturdy and keeps my laptop from heating up. I only have one problem with it: My laptop only has one usb port on the right and I use that for my mouse.
I have it on right now and I can honestly not hear it. My old cooling pad (that I got at Office Depot or some similar store) was extremely loud. At first, I didn't like how quiet it was because I couldn't tell which way the dial turned up (it was dark). But now I see there's a little inclined plane drawing that lets you know.My only complaint is that the design of the pad has a little indentation on the side facing you.
I can see anything over 16" being a bit over sized for this particular product. But Cooling Masters and Thermaltake make great products that fit bigger laptops. As for me, I am running 3.0Ghz, GT540M vcard, and currently have everything running at full performance. My temperature before I had the product on idle ran at about 42-45 cpu temp. Playing games it ran around 55-70 depending on the circumstances.
I didn't want to wait anymore so I took my chance on this model. I am not disappointed. It is more than sufficient. I did not need the expensive type where you can position one or more fans. I didn't need anything with bells or whistles or a technical review like you'd see on the pages of PC World. I am happy with one that doesn't plug into a wall but directly into my computer.My palm rest is now cool to the touch and no blue screens.
I used this product based on the reviews I got but I noticed that it doesn't really help cool down my laptop. I would turn on the cooling pad once the fans in my laptop were spinning faster then normal. I would pay attention to the internal thermometer and notice that the cooling pad didn't really make a difference in internal temperature.
My laptop has run hot since nearly day 1. I'm not a gamer either & the temperature in the room I'm usually in is 65 - 68. When my laptop starts  heating up, the fan in the cooling pad starts blowing very warm air & doesn't even begin to cool off the  bottom of my laptop.Cooling pad  is supposed to have 2 speeds. When I turn the dial, I can't really tell any difference.
I don't usually write reviews on amazon but after two years I've been so impressed with this product that I felt obligated to share my experience for curious searcher. So here goes:pros:+silent in the sense that you'll only hear the fan spinning if you are in an extremely silent room AND if you actively try to hear it. otherwise, it just fades into the background.
Answer: This unit is very quiet.  There's also a blue light that turns on when the unit is running.  There's only 1 fan blade in the middle of the unit. Using the blue light emitted by the unit you will be able to observe that there is a spinning fan blade in the middle. I have used this unit since September 2014 and it has worked great. My old laptop is known for overheating hence the reason I bought this unit.  There were several occasions that I've left the laptop on overnight, in the morning the laptop was still cool to the touch. I would buy another one of this when a need arise.