1-6Pcs Ultrasonic Electronic Pest Repeller Control Rat Mice Fly Rejector 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. Easy and convenient for use. Safe, environmentally-friendly Non-toxic and harmless to humans and pets Protects an area up to 80-120 square meters Low power consumption, suitable for long time operation. Powerful range of ultrasonic sound waves that drives away pests. Does not interfere with the operation of other electronic equipment. The Pest Control Repeller is the most humane method for being pest free. Pest Type: Cockroach, Mouse, Rat, Spiders, Mosquitoes, Ants, Bed Bugs, Fleas, Flies. Specifications: Voltage:220 (V) Power: 5 (W) Output frequency: 50Hz-60Hz Shell material: ABS Size: 6 x 3 x 9 cm Effect range80-120 square meters Plug Style: AU / US / UK /EU plug (important: For working normally, please choose the plug which suits yours) Package Included: 1 Pack Ultrasonic Pest RepellerCome with Box Note: 1.This machine should be installed at 80-120cm away from the floor,and should be certical to the floor ad plug to the power socket. 2.This installing poin should be avoided from carpet,curtain tec,attaching sound material or else,the decrease of the sound pressure will do harm on the helminthes effect. 3.Within 1 meter shall not have a large obstacle (that is not installed in the refrigerator, wardrobe, sofa and other objects on the back). 4.Can be plug directly to AC220V power socket. 5.Using environment temperature :0-40C . 6.It's normal that the mouse and vermin will increase at the beginning of the using days because they are getting away from the living place after the attack of the ultrasonic. Usually, it could take 3~4 weeks to notice results.