http://www.getaddictedto.com/tetriplug-for-a-better-world/

http://www.buzzfeed.com/radioshack/13-ways-to-make-your-old-electronics-new-again

http://ahpardi.com/2012/12/des-clefs-usb-en-recyclant-des-k7-audio-retro/

http://www.ignant.de/2014/12/21/4th-advent-gift-onkto-katuh-tetriplug/