4 Pieces Against Mice Ultrasonic Pest Repellent Electronic Insect Repellent Animal Repellent By_fsProduct Features: Works by continuously transmitting a powerful series of ultrasonic waves that repel pests and remain completely inaudible to humans and pets. Non-toxic and harmless to humans and pets, an alternative to toxic chemicals and dangerous traps. Protects an area of up to 80-120 square meters per unit. Low power consumption, suitable for long-term operation. Does not affect the operation of radio, television or other electronic devices. Specifications: Easy and convenient to use. Safe, environmentally friendly Non-toxic and harmless to humans and pets Protects an area of up to 80-120 square meters Low power consumption, suitable for long-term operation. Powerful range of ultrasonic waves that repel pests. Does not affect the operation of other electronic devices. The Pest Control Repeller is the most humane way to be pest free. Pest Type: Cockroach, Mouse, Rat, Spider, Mosquito, Ant, Bed Bug, Flea, Fly. Specifications: Voltage: 220 (V) Power: 5 (W) Output frequency: 20Hz-45Hz Shell material: ABS Size: 6 x 3 x 9 cm Effective area: 80-120 square meters Plug style: EU plug Package included: 4 pack Ultrasonic Pest Repeller with Box Note: 1. 2.This installation tip should be avoided by carpet, curtain, attach sound material, otherwise the decrease in sound pressure will affect the helminth effect. 3. There must not be a large obstacle within 1 meter (which is not installed in the refrigerator, wardrobe, sofa and other objects on the back). 4.Can be directly connected to AC220V outlet. 5. Using the ambient temperature: 0-40 C. 6. It is normal for the mouse and bugs to increase at the beginning of the days of use, because they move away from the place of residence after the ultrasonic attack. Usually it can take 3 to 4 weeks to see the results.