Before we had the device, we had a mouse in the trapdoor 4 mornings out of 5. Since the installation of this device, we've had peace of mind...no more mice in sight! On the other hand, the ultrasound is very audible and shrill, so it's impossible to leave it on when working in the premises.
Totally ineffective. Paid a lot of money for 0 results. In strong mode, the mice continued to attack the food reserves, even though they were 3 m in front of the device. I recommend that this brand re-evaluate their product, as it's really ridiculous compared to the mice.