Giving you access to personal virtual surround-sound, the RS 175 Digital Wireless Headphone System from Sennheiser consists of a pair of HDR 175 headphones, and a TR 175 transmitter. The TR 175 features an analog 1/8" stereo input along with a digital optical input for connectivity to a variety of audio and home entertainment systems, and functions both as a transmitter and charging station for the headphones. You can connect up to 2 headphones to the TR 175, by using an additional set of HDR headphones (not included). The HDR 175 headphones have a closed, circumaural design, and have dynamic bass boost and virtual surround sound modes, allowing you to customize playback. Analog and optical audio cables are included, along with 2 AAA rechargeable batteries.

• Closed, circumaural headphones with digital wireless audio transmission
• Digital audio clarity and transmission range of up to 328' (100m) (line of sight)
• Enables switching between dynamic bass and virtual surround sound listening modes for situational sound customization
• Supports analog and digital audio inputs and allows toggling between the inputs
• Intelligently designed controls for ease of use
• Multi-purpose transmitter also functions as 'easy-charge' cradle and docking station
• Multi-receiver transmission; transmitter supports up to two pairs of headphones simultaneously
• Ergonomic design for wearing comfort