Sennheiser RS 185 Headband RF Wireless Headphones - Black 505564 NOB Contents: Come with accessories in Retail Box. New Opened Box Condition. Specs Product Type: Headphone Earpiece Design: Over-the-head Earpiece Type: Binaural Minimum Frequency Response: 17 Hz Maximum Frequency Response: 22 kHz Wireless Operating Distance: 328.1 ft Connectivity Technology: Wireless Brand Name: Sennheiser Form Factor: Circumaural Wireless Technology: RF Sound Mode: Stereo Manufacturer: Sennheiser Electronic Corporation Product Model: RS 185 Product Name: RS