working principle: At present, various automobiles are frequently attacked by rats. Rats often get into the engine compartment of the car and bite off parts such as wires or oil pipes. The light ones cause the car to fail to start, and the severe ones even cause the car to spontaneously ignite, causing unexpected disasters. In order to prevent rats from invading cars, we have accumulated nearly 20 years of technical experience and market experience, and special electronic rat repellers for cars. This product can intermittently and alternately emit two kinds of ultrasonic waves with different frequencies and waveforms, which can effectively repel mice entering the car interior. This product adopts the most modern microelectronic technology, which can alternately and intermittently send out two kinds of ultrasonic waves with different special waveforms and frequencies, which act on the auditory system and nervous system of mice, making them feel uncomfortable and unhappy, and escape from the scene. Since the frequency of these electric waves is constantly changing intermittently, it will not cause "adaptability" and "immunity" in mice. This product adopts a special automatic control circuit. When the car is turned off and parked, the product starts to work; when the car starts and vibrates, the product stops working. Range of use: This product is mainly used in the engine compartment of various cars to prevent mice from entering the engine compartment and damaging the car. This product is mainly used to repel mice. At the same time, it also has a certain inhibitory effect on cockroaches, ants, spiders, crickets, bedbugs, fleas, silk moths, etc. Two: Turn on the power, touch the power switch, the red indicator light and the white light will continue to light for 2 seconds, and the horn will beep for 2 seconds at the same time, the machine will enter the working state of ultrasonic output and strobe light to repel mice. Ultrasonic frequency conversion output 12-24khz, at the same time 2 white lights flashing. The working time is 3 seconds, the intermittent time is 57 seconds, so the cycle works 3. When there is a vibration signal to trigger the circuit (the car starts), the ultrasonic and flashing lights will stop working, and the red indicator light will flash as an indication (once every 5 seconds). If there are multiple trigger signals, as long as a new trigger signal is detected, the time will be reset, and then count again, and the circuit will resume working after 120 seconds. 4. Touch the power switch, the machine shuts down (with a short beep) product features: Professionally developed waterproof and dustproof design, comprehensive protection Sending out ultrasound disrupts the nervous system of rodents Send frequency conversion ultrasonic frequency is 12-24kHz The flashing light and ultrasonic wave work simultaneously for 3 seconds and stop for 57 seconds Intelligent identification of engine start and stop, more effective protection of the car Three power supply methods, the mouse repellent is not limited by the power supply Scope of application: indoor, outdoor, car, garage, etc.