Questions about Cooler Master Notepal U3 Plus

So if you have a headset on or the volume of the speakers is pleasantly high, you don't hear the fans. It's just a background hum. I would describe them as rather quiet, but some people are probably more sensitive than I am.

No, there is no button to switch off. On the 3rd picture it may look like this, but this is the locking device to position or release the fans on the grid. There is a rotary control, but even at the minimum setting the fans rotate at 950 rpm according to the product data sheet.

It's very quiet, but on my power laptop the internal fan still kicked in, so it didn't do much for me.

Yes, I've also had a 17.1 inch that goes easily

The fans will spin and eventually the pad or whatever will detect this which is often the case because USB. Maybe USB is not only used as a power supply, but is also used to control the fans with a standard driver that is already stored in Windows10.

The fans will run, the MacBook should have USB 2.0 port. The fan pad only has anti-slip elements at the edge. The 13'' book cannot reach these and could slip over the pad. You can, for example, stick an anti-slip strip on the pad.

Hello AlanLe I use it for HP Envy dv7 - 17.3" (Dimensions: 41.6 x 27.4 x 3.52 cm) The laptop covers the whole surface of the cooler, but the cooler still manages to do the job. Hope this helps. Cheers, Tr00ba