This is the Cisco Phone Certified Plantronics CS540 + Cisco EHS Remote Answer Cable Bundle package. This package is Plantronics CS540 wireless headset bundle together with the remote Answering cable (EHS cable).   The package along with the CS540 wireless headset will allow you to answer Cisco IP phones remotely, up to 300ft away, Plantronics CS540 features the lightest office wireless headset on the market, a new streamlined design and improved performance. Two wearing styles, no matter what your preference. Enjoy the premium wideband audio quality and awesome wireless range.. Retail Price $499.99

Compatible with Cisco Phone 6945, 7821, 7841, 7861, 7942G, 7945G, 7962G, 7965G, 7975G, 8811, 8811, 8841, 8845, 8851, 8861, 8865 (do not order if your phone is not listed)

• Plantronics Cisco EHS remote answering cable included in this bundle package.
• Choose from three wearing options to match your personal style: Over-the-ear, Over-the-head, Behind the Neck (sold seperately)
• Wireless roaming range hands-free up to 350 feet
• Audio controls volume/mute at your fingertips
• Adaptive power system optimizes for range and talk time
• Wideband audio using CAT-iq technology enables clearer conversations
• Choose narrowband mode to preserve talk time or wideband mode for clearer conversations
• Noise-canceling microphone blocks out most of the background noise
• SoundGuard technology protects against audio spikes
• Conference in up to three (3) additional CS540 headsets for enhanced collaboration

For more details, see Plantronics CS540 datasheet & Plantronics CS540 user manual