Do you have an air pump?
I think it is a flexible weighted bubble wand. Looks fancy! Plugged on the end open on the other to hook up a piece of air tubing to then lay or bury the rest in any shape around decor and air is emited through porous spaces in the tube.
That's my guess. Yay, guesing game! You can just try blowing through the open end and see if you can feel air, or hook up the air pump to make sure it is what I suspect.
Also it is best to keep the pump well above water level and have an air check valve on it so it doesn't draw water into the pump, there is an "in" and "out" to it, might say on the ends that attach to the tubing.