Product Description: This Ultrasonic Pest Repeller Control Electronic Repellent Mice Rat Reject 2018 applies a powerful ultrasonic wave to repel away bugs, mice, cockroaches, rodents, spiders, ants and rats, while remaining fully safe for humans and pets. Product Features: Works by continuously transmitting a powerful range of ultrasonic sound waves that drives away pests, while remaining 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 up to 80-120 square meters per unit. Low power consumption, suitable for long time operation. Does not interfere with the operation of radio, television or other electronic equipment. Specifications: Color: White + Black Material: ABS Plug Type: US /EU/AU/UK Plug Power Supply: AC 90V-250V, 50-60Hz Power: 5-6W Ultrasonic Frequency: 22-65KHz Effective Range: 80-120 Square Meters Working Temperature: 0-40°C Product Size: 90 * 55 * 50mm / 3.54 * 2.16 * 1.97in Product Weight(1pc): 47g / 1.66oz Package Size: 13 * 10 * 10cm Package Weight: 242g Package List: 1/2/4 * Ultrasonic Pest Repeller Note: 1. This machine should be installed at 80-120cm away from the floor. And vertical to the floor and plug to the power socket. 2. The installing point should be avoided to be in the back of the curtain, fridge, and any other furniture that deterring or attaching frequency. 3. It's normal that the mouse and vermin will increase at the beginning of the using days. Because they are moving away from their living place after the attack of ultrasonic. 4. Don't clean the machine by strong impregnant, water or damp cloth. Use dry and soft cloth with some neuter wash to clean it. 5. To increase the effect, you should use several sets machines at the warehouse or goods pile-up, several rooms. Converse : 1 inch = 2.54cm or 1cm = 0.393 inch