Compatible with the following headphones:

Sennheiser RS110 RS-110

Sennheiser RS120 RS-120

Sennheiser RS130 RS-130

Sennheiser RS160 RS-160

Sennheiser RS170 RS-170

Sennheiser RS180 RS-180

Sennheiser RS195 RS-195

Sennheiser PXC 250-II

Sennheiser PXC 350

Sennheiser PXC 450

Sennheiser HDR 170