They are the largest national oil and Gas Company in Thailand. PTT commits itself to be “a good corporate citizen to protect the environment and improve the quality of life of the communities”. They come up every year with souvenir gifts for their customers that would have an impact on environment concerns. One souvenir they created was a mobile radio, powered by a small built-in dynamo. A built-in hand winds up the dynamo, and the radio works in an environmentally, friendly way.