【QS + QC dual frequency modulation】Prevents mice and mosquitoes from developing immunity. Using microelectronic technology can produce dual frequency ultrasonic waves alternately and intermittently at the same time. To prevent mice and mosquitoes from becoming " adapted " to a fixed frequency. Dual-mode FM drives out not only mice but also mosquitoes and flies Cockroaches, etc, can be used to meet the needs of the family frequency. 【More advanced】The upgraded chip pest control helps to produce stronger ultrasonic waves that can influence insects and rodents' animals' brains, repel them away from your home. The pest repeller plug in can control mice, rodents, mosquitoes, ants, spiders, roaches, rats, etc. 【Large control application】With the latest chip, each ultrasonic mouse repeller can effectively control up to 100 - 150 square meters. The ultrasonic mice repeller indoor can maximize the effect with one unit per room since the sound waves would not be transmitted by the walls. 【Safety and comfortable】The mosquito repeller is noiseless. It control pests and rodents away but does not harm humans and pets. Besides, the longer the duration working, the better the repelling. 【Easy to use】Just plug this insect repeller for indoor plug in into a socket vertically, the blue light is turned on and working automatically. Please do not cover this electronic rodent repeller with the kinds of stuff that can interrupt its effectiveness. For Home Indoor Ultrasonic Mosquito Mouse Repeller Electronic Anti Rodent Insect Pest Control Repellent. QS + QC dual frequency modulation prevents mice and mosquitoes from developing immunity. Using microelectronic technology can produce dual frequency ultrasonic waves alternately and intermittently at the same time. To prevent mice and mosquitoes from becoming " adapted " to a fixed frequency. Dual-mode FM drives out not only mice but also mosquitoes and flies Cockroaches, etc, can be used to meet the needs of the family frequency. Ultrasonic rat repelling principle: The instrument interfered with the rats by the frequency conversion of multi-stage ultrasonic stimulation frequency, which made the rats' hearing level disordered. Mice feel panic, and then automatically migrate, to achieve the mouse effect. Features & Specifications - Two Ultrasonic Modes: Rodents Mode and Insect Model - Light Color: Yellow & Red Light - Ultrasonic Frequency:20 ~ 80KHz -Material: ABS High-Quality Flame Retardant Material -Feature: Environmental Protection, Safety, No Odor -Voltage: AC 110 ~ 220V -Power Consumption: <1W -Ultrasonic Frequency: 20 ~ 80KHz -Effective Range: 15 ~ 30m² - No Harmful Chemicals Or Poisons, Noiseless, Safe, Easy To Use. - Repels Bugs,Ants,Mice,Cockroaches,Mosquitoes,Spiders,Rats,etc. - Non-toxic& Environment-friendly, Standard Wall Plug-In, Indoor Use Only - Effective coverage area: 80 ~ 120 square meters. Operation process: 1. Plug the product into a 220v power socket and the product begins to work 2. When the yellow indicator light flashes, it indicates that the product is emitting overlapping frequency, ultrasonic waves to drive away mice. 3. When the red indicator light is on, it indicates that the product is emitting scanning frequency, ultrasonic wave to repel mosquitoes, cockroaches, etc. 4. To switch the driving mode, press and click the button on the product to switch. Note:The 2 modes couldn't work at the same time,you need to press the switch button to change the working mode. Package Includes 1/2/4/6/8pcs Mosquito Mouse Repellers !!! Pests such as mice and mosquitoes feel restless after 1 month of use, so they run around everywhere. This will cause you to see the pests become more active, which is their normal behavior when they are sonicated. Please continue to use, they will gradually escape after 90 days of continuous use, and it is recommended to use it all year round.