An extention cord thingy.
I got it in some cheap chinese goods place so i thik it was like 15€.
It was an impulsive purchase (i am the type to get tools impulsivly)
But for a long time it was a useless dust catcher.
After i moved there finally where oppertunities for it.
So at that point it got unexpectedly useful.

For summer i reccommend buying a hand fan + a spray bottle (spray water on skin & use fan, its really nice)