HIGH-QUALITY DEVICE - 3 YEARS WARRANTY. Donnerberg Shiatsu Massager is an original German brand. High quality products are of the highest priority for Donnerberg. The quality of Shiatsu Neck Massager has been tested by the accredited test center TÜV Rheinland Bauart. Certificate number: Z2 15 04 91698 002. TÜV link: www.tuev-sued.de/ps-zert. Donnerberg Neck Massager is recommended by the German Confederation of Olympic Sports.