"P-Per was one of the Red Dot Concept Design Award that designed by Chocolate Design Agency (www.chocolate-agency.com). It is an impressively simple and sustainable mobile phone combing features that were supposed to be incompatible: simple, advanced, green and unique. It made out of only 4 layers of sustainable materials, the "1 function -- 1 part -- 1 material" rule facilitates disassembly and materials recycling."
