Sennheiser RS 165 Headband Wireless Headphones System - Black ————- Contents: Headphones, Charging Stand, Power Cord, Aux Cable. Used Tested Working - In Good Condition. Product IdentifiersBrand SennheiserMPN 505562Model RS 165eBay Product ID (ePID) 209700406 Product Key FeaturesFit Design HeadbandFeatures Noise IsolationColor BlackManufacturer Color BlackEarpiece Design Ear-Cup (Over the Ear) Additional Product FeaturesMinimum Frequency 18Sensitivity 106dBMaximum Frequency 21Impedance 32ohm