Additonal headphone for wireless headphone systems RS 115, RS 117, RS 119, RS 119-II, RS 120, RS 120-II. The HDR 120 delivers great transparent and well-balanced sound. Matched with exceptional bass response, it is ideal for TV applications and all music types. (Wont work as a standalone device, Headset Only) Features: - Open, stereo, supraaural, wireless RF headphone - Detailed, analytical sound reproduction with strong bass response - Suitable for all types of modern music and TV applications - Wireless freedom with reception through walls and ceilings - Very lightweight headphones, extremely comfortable to wear - Appealing, modern design What's in the box Sennheiser HDR 120-8 Headphones