In laughing the vole

Seriously. Those things are high for the price yes okay, so I also give you a point. But the effect is = 0. I have 2 pieces of it bought for about 60 sqm garden (which is not much). Approximately one week after the sinking in the ground, I noticed that right next to those things most tunnels were dug. Except that I hear these things at night on the 2nd floor with the windows closed and they distribute rather me bring these parts nothing. Category: bad investment.

I would invest the money differently next time.