Power parameters and other instructions Universal power adapter, switching power supply transformer The power supply for voltage requirements for the 4.8v-5.2v range, the current demand for equipment within 2a or 2a DC power applied to the electrical needs 5v2a development board, removable hard disk, etc. The power supply voltage is suitable for all kinds of needs 5v 2A or 2A below current DC input products, can not overload to use! Power selective attention, you need to follow to select the voltage consistent electrical current is equal to or higher than the required current power supply Input voltage (INPUT): 100-240V 50-60Hz The output voltage (OUTPUT): DC5V-2A Power (MAX OUTPUT POWER): 19W Overall: If the following pictures are all physical map length 1m Polarity: Internal positive, external negative DC Plug: 5.5*2.5mm