Shares of Great Wall Builders Ltd. (OTC: GWBU), owner of exclusive manufacturing and distribution rights to the Start FEED technology, fell in Monday’s trading session. The penny stock of GWBU ended the day 0.61% lower at $1.62, with volume at 3 million. The stock gained 4.55% in the last three trading sessions.

Great Wall Builders on Monday announced that that it has been certified for its ability to reduce tailpipe emissions by DEKRA Automotive.

DEKRA is one of the two major vehicle certification providers in Europe. It is based in Germany and operates in 27 countries through 166 subsidiaries and associated companies. DEKRA said that fitting a vehicle with Start FEED unit typically improves tailpipe emissions by 2 classes under the Euro standard ranking system.

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