" How it works: the marten repellent emits periodically high ultrasonic tones that are very unpleasant to the marten. This avoids the environment around the device. Integrated interval switching of 80 seconds prevents habituation effect. Environmentally friendly and radiation-free for humans: the marten deterrent has been developed for the sensitive frequency of martens or mice. For people and pets, these high-frequency sounds are barely noticeable. The very high tones disturb the martens, but not people and pets. Therefore, it can be used anywhere in the house. Easy installation: the marten deterrent with 3 possible power sources. The marten deterrent can be operated via car battery, USB port or batteries (not included). Instead of cumbersome wiring, this innovative device can be used immediately in all conceivable places without connection. The device is installed within 3 minutes. Versatile use: universal marten deterrent for all cars and brands. Thanks t