I pried open the EdiMax Smart Plug SP-2101W (US Version) and took a few pictures.
The Smart Plug can be easily opened with a triangle head screwdriver size ▵18 (1.8mm size ▵). Remove the four screws.
The case can be separated using your finger nails or a nylon pry tool. There are four clips total with two clips on each side.
Here are the components on the top side of the main board:
U201 - Prolific PL833?
(may be this: Products)
U102 - AJ49F
U101 - Power Integrations LNK306
Here are the components on the bottom side of main board:
Here are the components on the top side of daughter board:
Uxx - Ralink RT5350 Wi-Fi System-on-Chip
U35 - to be determined
Here are the components on the bottom side of daughter board:
U10 - Fidelixx 25Q32A - 32M-BIT Serial Flash Memory