The TBK Wii-link RF600 PRO 2.4 GHz Wi-Fi Booster.

I've been looking at 2.4 GHz Wi-Fi signal boosters lately, and one (reportedly) powerful (4 Watt) and cost effective (~$100) amplifier is the TBK Wii-link RF600 PRO.

Time for research!

It seems to be manufactured by ShenZhen TBK Electronic Co., Ltd

The most official listing I could find is: http://tbkchina.en.alibaba.com/product/922769231-218833311/2_4G_4W_Waterproof_RF600_Pro_0utdoor_Wi_Fi_Booster.html

As you can see their Alibaba page is: http://tbkchina.en.alibaba.com

Here is the circuit board diagram (Clean version):

And a higher resolution version:

The rest of the images are the highest resolution I could find.

The board, top half:

 

The bottom half (upside down):

 Close up of the switch:

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In the box:

Hey look! Other models (RF600-AP, RF600N, RF600N-AP, RF606):