There are two basic types ,one is fit power line(extension cord socket),and another is without power line(original socket). as show below figures:
Both original socket (E01/E02A/B/C)and extension cord
(E03/E04A/B/C) socket have four types:
E01( Socket adapter): Only has 5 power outlets ;without cord.
E02a( Socket adapter with USB): 4 power outlets ,2 type A outlets (5V-2.1A) ;without cord.
E02b( Socket adapter with USB): 4 power outlets ,2 type A outlets (5V-2.1A),a touch switch power light;without cord.
E02c( Socket adapter with USB: 4 power outlets ,2 type A outlets (5V-3.1A),a touch switch power light;without cord.
with fast charging ;
E03( Extension socket ): Only has 5 power outlets .with cord.
E04a( Extension socket with USB): 4 power outlets ,2 type A outlets (5V-2.1A);with cord.
E04b( Extension socket with USB): 4 power outlets ,2 type A outlets (5V-2.1A),a touch switch power light ;with cord.
E04c( Extension socket with USB): 4 power outlets ,2 type A outlet (5V-3.1A),a touch switch power light,
with fast charging;with cord.lo