Technically it works, technically not

Now, after nearly three weeks of continuous use, I can and I have to say but unfortunately: The thing is good for nothing!

We live in an apartment building and the next door neighbor has a cat, which depends continuously on our balcony. That would not be so bad (we like cats principle), if it were not in our large potted plant ka ** s. Therefore, we had bought us this device, in the hope that this keeps the cat away. It seems however to be resistant to the whistle. Namely you sit frequently max. one meter next to the device (which mind you while also the whistle is), looked at me with her big eyes and makes "Meow!".

Therefore: technique works in principle, action is underground!