. ▁In ▁early ▁ 2 0 1 7 , ▁Ch ia rel li ▁sold ▁his ▁shares ▁to ▁Jeff ry ▁Pier ge orge . ▁ ▁History ▁ ▁In ▁ 2 0 0 7 ▁Ch and ler ▁Br id ges ▁and ▁Rob ▁Ch ia rel li ▁begin ▁experiment ation ▁in ▁loud spe aker ▁and ▁micro phone ▁design . ▁In ▁ 2 0 0 8 ▁G au ge ▁P rec ision ▁Inst ru ments ▁introdu ces ▁the ▁EC M - 8 7 , ▁their ▁first ▁card io id ▁cond enser ▁micro phone . ▁G au ge ▁introduced ▁the ▁EC M - 4 7 ▁in ▁ 2 0 0 9 , ▁their ▁first ▁multi - pattern ▁T ube ▁micro phone . ▁That ▁year ▁G au ge ▁also ▁introduced ▁the ▁USB - 8 7 , ▁a ▁Universal ▁Serial ▁Bus ▁power ed ▁micro phone ▁designed ▁specifically ▁for ▁use ▁with ▁the ▁personal ▁computer , ▁and ▁the ▁EC M - 8 4 ▁and ▁EC M - 8 4 SE , ▁their ▁first ▁small ▁dia ph rag m ▁elect ret ▁cond enser ▁micro phone . ▁In ▁ 2 0 1 0 , ▁the ▁company ▁introduced ▁the ▁EC M - 5 8 , ▁their ▁first ▁hand - h eld ▁dynamic ▁micro phone . ▁The ▁EC M 5 8 ▁was ▁dis cont in ued ▁in ▁April , ▁ 2 0 1 2 ▁and ▁the ▁company ▁introduced ▁the ▁EC M 8 7 ▁Ste alth ▁Micro phone , ▁an ▁alternate ▁version ▁of ▁the ▁EC M 8 7 ▁Classic . ▁In ▁ 2 0 1 3 ,