2pcs Ultrasonic Indoor Silent Mouse Repeller Insect Repellent SetSpecificationsProduct Name: Ultrasonic Mosquito RepellentMaterial quality: ABSVoltage: 100-240V AC, 50/60HZPower: 2.5wOutput Audio: 20-65KHzElectrical plug-in device: no outdoors, hot, water or other liquids or humid environment.Coverage 100 to 800 square feet, no obstacles in front of the device that may obstruct the ultrasonic waves.Shipping list2 x ultrasonic pest repeller.Continuous Pest Defense Process:Week 1-2: Latency period - this period begins to attack the pests and constantly disturb, thus irritating the broadcast system.Week 3: Effective period - non-invasive and nervous system of the pests, which reduces the possibility of survival,makes it unbearable and runs away from your home.Week 4: Stable period - strongly depends on the reproductive function of the pest. It's easy to say goodbye to pests.So that the pest does not return inside, it must be used further.It is normal that in the first days of use, pests and mice appear more and more often as a result of molesting ultrasounds from the current area of life.It may take up to 3-4 weeks for the first results to be obtained, depending on the severity of the attacks.NoteKeep away from carpets, curtains, and any sound absorbing material that may affect performance.Do not use this mouse repellent near pets.Ultrasonic waves cannot pass through walls. We recommend installing one device for each room.The operation of the ultrasound device in one day is not very obvious, it takes 1-2 weeks. 3-4 weeks the effect is significant to see.