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I was somewhat sceptical about this product, but the price was right, so I went ahead and purchased it and I'm glad I did! It's very easy to operate and the air it produces is lovely and cool. It's perfect for an office desk or beside a bed. It's not overly noisey either. Add ice cold water and the frozen block and you'll be lovely and cool.
I'd never considered buying a "cooling" unit until the hot weather this year, although I had a fan already. I changed my mind about that when it got to 34 degrees in our "home office" (during enforced work-from-home) over a period of a few days.
This unit is compact but effective if placed close to you. (The instructions suggested putting it about 1.8 metres away from the area to be cooled, but I didn't find it as effective when I did that.) On the low setting it's fairly quiet, makes about as much noise as my computer. The '2' and '3' settings provide a lot more cooling but are quite noisy, although I found I got used to the noise and tuned it out quite quickly.
When first setting it up I found it did spill some water underneath, I think I moved it while it was getting its water reservoir filled for the first time (the instructions do say not to move it), so I would recommend putting a tea towel or similar underneath it when first setting it up if you don't want to get water on your surface. However once set up, it's been running smoothly and I've moved it around the house with water in (making sure to keep it level) and haven't had any spills. To be fair there is a warning label saying "do not move unit when it is on or when water is inside of it".
It's USB powered and currently attached to a USB port in the front of my computer, but also works with any USB mains plug (of the type that everyone has about 20 of in their house, as it seems that one comes with every electronic device these days) - the package itself doesn't include a USB mains plug, but it is compatible with any normal plug.
I've had variable results with powering it from a power bank, so I wouldn't suggest trying it.
The "dual ice packs" means that 2 ice packs are supplied but the unit only takes one at a time, so that you can have one in the freezer and one being used at any point in time. It is a bit fiddly to change the ice pack, as you need to unscrew the cover (which is like the cover of the "battery compartment" of remote controls and things like that... a plastic cover with tabs on) before you can remove it. I've no idea why they decided to design it like this.