... . Acoustic ear tube / air tube earpiece with coil cord design. 3. The use of special materials (polycarbonate) manufactured housing, can reach ... , TK-2101,TK-2102 , TK-2107 , TK-2118 , TK-2130 , TK-2160,TK-2170 , TK-2173 , TK-2200 , TK-2201 , TK-2202 , TK-2200L , TK-2202L , TK-2206 , TK-2207TK-3100 , TK-3101 , TK-3102 , TK-3107,TK-3118 , TK ...