<prompt> Translate the following text to EnglishKulingana na gazeti hilo, kificho cha kifaa hicho kilikuwa kimehifadhiwa kwa uangalifu na kampuni ya Marekani inayozalisha kifaa hicho, Bioelectrical Shield Co, ikinukuu mwakilishi wake wa Uingereza akisema anaamini kwamba Bi Blair aliamua kununua kifaa hicho baada ya kupendekezwa na Hillary Clinton.  <response>: The secret formula for the pendant was closely guarded by its U.S. manufacturers, the Bioelectrical Shield Co., the newspaper said, quoting its British representative as saying he believed that Mrs. Blair had decided to buy one after a recommendation from Hillary Clinton. 