HP Poly CS540-XD 900Mhz Wireless Convertible System 
The XD stands for Extra Density. The CS540-XD is designed for high density wireless environments, so more wireless headsets can be used in the same space without crossing frequencies and reducing call quality. With a 900 MHz frequency you get a 350 feet of range from the charging base, along with superior call management and Plantronics best-in-class audio quality, this wireless headset rocks the office.

• 350 foot range. Duck into different offices around the building while on call.
• Convertible wearing style: over-the-ear, over-the-head, or behind-the-head. Now your comfortable and your hair looks great.
• Smart charging base. It saves power when you're close by. Also, subscribe and conference three additional headsets to the same base simply by docking the headset, making collaboration a breeze.
• Manage calls like a pro. One-touch call answer/end, volume +/-, and mute from the headset and use an Electronic Hookswitch Cable (EHS) or Handset Lifter (HL) to remotely answer and end desk phone calls.

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