The Ultrasonic Principle works:Both male and female mosquitoes are scared of 26~28KHZ ultrasonic waves from bats. Rats will send out 30~50KHZ ultrasonic waves when they are under threat, and adult rats can even send out such ultrasound waves for help. According to this principle, electronic equipment that produce powerful high power ultrasonic pulses can interfere or stimulate the auditory system of mosquitoes and rats effectively. Pests will feel insufferable and panic, showing symptoms of twitching and escaping.The auditory range of human ear is 16~20 KHz or so, while the output power of the ultrasonic rat repeller is over 20 KHz generally. Besides, the power of ultrasonic pest control is relatively small, generally about 5W, which is unable to affect human body.【Features:】✔ Standard Wall Plug-In✔ Material: ABS,non-toxic and Environment-friendly ✔ Ultrasonic Frequency:20-55KHz ✔ Power Source: AC90V-250V/50-60HZ✔ Power: 5W【Instructions:】 ❶ This machine should be installed at 20-80 centimeter away from the floor. And should be vertical to the floor and plug to the power socket.❷ The installing point should be avoided from carpet, curtain etc attaching sound material. Or else, the decrease of the sound pressure will do harm on the helminthes effect.❸ It's normal that the mouse and vermin will increase at the beginning of the using days. Because they will get away from their living place after the attack of the ultrasonic.After 2 to 4 weeks, it will create effects. ❹ This machine can be plug directly to AC 220V (or 110V) power socket. Don't drop the machine and make strong striking on it. Using environment temperature: 0-40℃ ❺ To increase the effect, you should use several sets machine at the warehouse or goods pile-up, several rooms.【Package Included: 】①1 X Electronic Pest Repeller,②1 X Bonus Camphor Stick
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