As with other home appliances, the Plamedi Air Mini should not be stored in areas with high humidity, high temperature, and/or direct sunlight. Avoid storing the device in areas where magnetic fields (or electromagnetic waves) are generated. Please also use the device in accordance with its voltage requirement (DC 5V, 0.5A). When connected to a USB port of a PC or laptop, the device may not operate to its full extent due to insufficient voltage supply. For detailed precautions, please read the user manual enclosed in the packaging.