An online company has begun marketing an "Anti Vuvuzela Filter" that promises to silence the sound of the controversial plastic trumpets that have become the trademark of South Africa's World Cup.

Vuvuzelas became the unofficial symbol of the World Cup, but they drowned out crowd chants and made it nearly impossible for players to communicate with each other.

South Africa's vuvuzela trumped the Mexican wave in the big match of the day in the stands while Mexico salvaged a late draw against the hosts in the World Cup opening gameon Friday.