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Features: 100% Brand new and high quality!! This machine should be installed at 80-120 centimeter away from the floor. and should be vertical to the floor and plug to the power socket The installing point should be avoided from carpet, curtain etc attaching sound material. or else, the decrease of the sound pressure will do harm on the helminthes effect. This machine can be plug directly to AC220V(or 110v)power socket. (Power range:Ac90v-250v.Frequency:50HZ-60HZ Caution: moisture proof, waterproof Don't clean the machine by strong impregnant, water or damp cloth. Use dry and soft cloth with some neuter wash to clean the machine Don't drop the machine and make strong striking on it. Using environment temperature:0-40Centigrade.