Received with one broken fan. Only 4 of the 5 fans worked. Attempted to process a return. Seller contacted me and sent a replacement. The replacement also only had 4 of the 5 fans working. So I took both apart. First fan was broken with an attempt to glue it together before selling. Unfortunately this fan isn’t fixable even when glued. The second fan had a severed wire. I cut the wire and used electrical tape and was able to fix that fan. I’m only rating 4 because seller shipped a replacement and I know I’ll get an email from them if I don’t rate high. I don’t think I would recommend this though. Definitely a crummy product. Once fixed it lowered the water from 78 to 70. Still high for an axolotl but better than no cooling product.This fan has lots of power, definitely more than I expected. When this one dies I'll be buying another one just like it!I'm assuming the two settings is just flipping it around since there were no instructions and no way to switch the settings.... I have a 20 gallon long filled about 4 inches from the top and has only cooled the water by about 2 degrees. Not exactly worth what you pay for it.This fan wasn’t cheap but the quality of the fan is very cheap! Only had it for a month for our axolotl and it already sounds like it’s falling apart.Beyond disappointed in this sub par item, worked fine for one week, then while away for 2 days to visit our new grandchild, came home to see a short in item caused breaker to turn off entire 125 Gallon 5 year established aquarium, which obviously depleted O2 to the system and caused massive Genicide to our precious Emperor Angel (grew from Juvenile), Clown Trigger, Wrasses, bennies, tangs......Just sick about it.....DO NOT buy this item may cause casualties.........