Description: Ideal pests repelling device for living room and other places where insecticides are inappropriate. The ultrasonic waves it emits are non-toxic and tasteless, safe to persons and pets. Ultra-low power consumption; without effects to electrical equipment. Ultrasonic frequency 120-150sq m of protection To increase the effect,you should use several sets machine at the warehouse or rooms. Specification: Using environment temperature:0-40 Material: Plastic ABS Frequency ranges: 25-28khz Power source: AC80V-240V 50-60Hz Power frequency: 20-80Hz Power:5W-6W Effective range: 60-80sq.meters Plug Type: US Plug Color: White Installation height:30cm from the ground Size: Approx. 106x62.8x27mm/ 4.17x2.47x1.06inch Package Includes: 1 Piece of Ultrasonic Note: Please allow 1-3mm error due to hand test The color may be different for the different display, please understand A few days before using, if found rats, pests and other activities increased significantly, Don't worry about it. Because usually hiding in the nest of rats, insects by ultrasonic and electromagnetic attacks, have fled their original hiding place Thanks for your browsing and understanding!