Note: DC5.0V1000mA one is the output voltage and current, 4000mAh is the capacity of the power supply, the unit of capacity is generally milliampere-hours (milliampere-hours), indicating that the mobile power can discharge for one hour with this current output. Output 1000mA refers to the maximum current that the mobile power supply can output. The fan 1000mA in the manual does not refer to the battery capacity.