The marten-free device genarates an acoustic signal with a frequency of 12 kHz in intervals of 15 seconds. This ultra high frequency is sensed by the martens as perturbing and nasty, so that they flee from the vehicle the device is installed in.
The marten-free device genarates an acoustic signal with a frequency of 12 kHz in intervals of 15 seconds. This ultra high frequency is sensed by the martens as perturbing and nasty, so that they flee from the vehicle the device is installed in.