Sennheiser Adapter 3.5mm socket - 6.3mm jack

RS 110-II, RS 120-II, PXC 150, RS 180, HD 425, PXC 450, RS 4200-II, PXC 350, PXC 300, SET 900, Set 840-TV, Set 840 S, Set 830-TV, Set 830 S, IS 410, HD 430, HD 477, HD 497, EH 350, HD 201, SET 55 TV, RS 160, RS 170, HD 420, HD 442 II, HD 440 II