1.The main function of this product is to boil water. After the power is off, the heat preservation time is about 2 hours. 2.To boil water, you need to tighten the lid and open the piston on the lid of the cup.After the water is completely boiled, you need to wait 30 seconds to 1 minute before the product will automatically power off.Without a lid, it is difficult for the temperature in the cup to reach the automatic power-off temperature set by the temperature control, and manual power-off is required.. 3.There is no way to automatically cut off the power in areas with an altitude higher than 800 meters, and you need to manually cut off the power. 4.When boiling water, you need to open the piston on the lid of the cup. Otherwise, the high temperature will cause the piston to deform. The deformation of the piston due to the customer's own reasons is not within the scope of after-sales. Thank you for your understanding.