General description The Anti Mosquito Ultrasonic Plug is an effective pest repellent device designed to repel a variety of pests including rats, spiders, mosquitoes, mice, and cockroaches. Utilizing intelligent frequency conversion technology, it emits ultrasonic waves to deter unwanted guests from your home. Technical specifications Ultrasonic frequency: 20~55 KHZ Effective coverage area: 80-120 square meters Installation height: 10-30 inches from the ground Installation Simply plug in the device to activate. Install 10-30 inches from the ground with no obstacles within 1 meter. For optimal results in areas with serious vermin, consider installing 2 or more devices. Usage Effective in homes, warehouses, offices, supermarkets, and hotels. Note that devices installed in one room will not be effective in other rooms. Other information No need to clean up dead pests or deal with bad smells. No batteries required, providing cost savings over time. What you get: 4 Packs Ultrasonic Pest