The two types of power supplies are 5V 1A and 5V 2.4 A. They are both used to power devices that require a higher voltage than what is available from the wall outlet. However, there is a big difference between them. 5V 1A supplies are designed for low-voltage devices such as digital cameras and cell phones, while 5V 2.4 A supplies are designed for more powerful devices, such as gaming consoles and servers.