1. Functional principle: This marten deterrent ultrasound emits changing ultrasonic waves at 1536 kHz, accompanied by a flashing light to achieve the repellent effect. This is an ongoing process, so please be patient and use it for 24 weeks. 2. Wide range of applications: The marten protection device for cars can be powered by 4 AA batteries, a 512V car power supply, or USB, making it suitable for various places such as attics, garages, and car engine compartments. The effective coverage area is 4050 square meters. 3. Intelligent operation: When the car starts, the vibration sensor of the marten deterrent activates, and it automatically stops working. After the car is parked for 120 seconds, the device switches on again and resumes its working mode. 4. Special ultrasonic waves: The ultrasonic waves generated by this marten repellent device are inaudible to humans and pets but disturb martens, helping you avoid their nuisance and maintain a quality living space.