Sennheiser HDR 120 Additional Wireless Headphones for RS120 System Please note: This is only for Additional Headphones, Receiver not included. New Opened Condition. Contents: Headphones, Manual. Product Information The Sennheiser HDR headphones are suitable for gaming devices, music gadgets, and home theater systems. When this accessory is used, the range of sounds that emit out of the wireless headphones is balanced. This means that you’ll hear professional-quality bass tones and treble effects that are extremely crisp. This product is