What does 2A (Amps) mean

2A (Amps) is in reference to the electricity flow required to power your Dp DOCK.

The Dp DOCK requires 2A in order for it to function. 2A is 240 watts (120 volts)

For reference, a standard “fast charger” Power Support USB-A port is also 2A (Amps) 

The Dp DOCK can be used with a fast charger.