Ensure the longevity of your Sennheiser product with these Genuine Sennheiser OEM Chargers. This product is compatible with the following models: RS 120 II 9 AA, RS 120 W, RS 126 9 II, RS 135 9 AA, RS 165, RS 175, RS 175 U, RS 185, RS 195, RS 195 U, SET 840. Please note that this is only the adapter not the power supply.