Electrical safety precautions: 1. Before checking or repairing the air purifier, the power supply of the air purifier must be disconnected. 2. Make sure that the power cord is not pressed by hard objects. 3. If the power cord and connecting cord are not long enough, you must obtain the special power cord and connecting cord from the manufacturer or distributor. Do not extend the connection from it. 4. The power supply with the same voltage and frequency as the product nameplate must be used. 5. Don't unplug the power cord when the air purifier is working, so as not to damage the circuit. 6. Please don't put anything on the top of the air purifier, make sure that the air outlet or air inlet of the air purifier is not blocked, and don't use it near walls and curtains. 7. Do not use heating equipment around the air purifier. Improper operation may lead to fire, electric shock or other injuries.