1, the voltage of the device being charged and the USB voltage is the same, the general USB standard voltage 5V, the current standard for 500mA.
2, the device being charged at one end of the interface for the USB interface.
Power adapter (Power adapter) is a small portable electronic equipment and electronic appliances power supply conversion equipment, generally by the shell, power transformer and rectifier circuitry, according to the type of output can be divided into AC output type and DC output type; according to the connection can be divided into wall and desktop type. Widely used in telephone sets, game consoles, language repeaters, Walkman, laptop computers, cellular phones and other equipment.