You can turn it off and on by holding down the power button. And it cools more than a fan, where the fan blows air, which when it is very hot does not help, this one cools the air in front of it. It is therefore much more effective than a fan.
Approximately. The unit does not normally cool a room per se. It works more like a fan with a cooling function. Coolness is simply felt in the area in front of the unit. And in that respect it works perfectly - by evaporating the water that is added. You just have to refill it again and again.