Variable Frequency: The latest designed powerful 8W repeller, capable of emitting 50~60Hz ultrasonic waves, in addition to our repellent is equipped with real-time visual display of ultrasonic frequency, in order to Prevent noise from being used with a fixed frequency, the microcomputer automatically changes the frequency intermittently. Make the product both efficient and intuitive for you Scary Lights: According to experiments, mice are inherently very light-resistant and like dark and humid environments. Thus our mouse repellent sparkles through the lights to frighten the mouse and (lightness adjustable on 3 levels). This is different from the mouse repellent on the market. What makes our products more effective Large coverage area Each electronic ultrasonic repellent is effective for a large area. Which is much more powerful than other cheaper repellents. Please note that ultrasonic waves cannot pass through walls. Although our insect repellant works well, if you have a large infestation we recommend that you place our insect repellant in every room Safe and Quiet: Non-toxic and environmentally friendly ultrasonic repellent, our repellent is safe and effective, the ultrasonic frequency emitted by this machine is inaudible to humans and pets. Safe for children, family and pets. Indeed, an idea to get rid of the hassle of rats and parasites Easy to use This machine should be installed 20-30 centimeters from the ground for rats. And vertical to the ground and plug it into the outlet. It can be plugged directly into a 220V AC outlet. Can be widely used in homes, warehouses, shops, hotels, hospitals, offices, etc. Save your costs as much as possible Product description Size: 76*59*30MM Product Specifications: Ultrasonic frequency: 22-72 KHz. Supply voltage: AC 110 ~ 240V Rated power: 5-8W Material: ABS. Black color. The package includes: 2 packs. Instructions: 1. Stay away from rugs, curtains and sound absorbing materials which may reduce the effect. 2. The number of rodents and insects may increase during the first few days. And the repellant will drive them away completely for about four weeks later. 3. It is normal for mouse and worm to increase at the beginning of the days of use, as they move away from the living place after the ultrasound attack. Reduction in parasitic activity should occur within 2-3 weeks. 4. Ultrasonic sound cannot penetrate furniture, cabinets or walls, leaving enough space around the area where it is connected. To increase the effect, it is necessary to use several devices in the warehouse or in several rooms.