Plantronics HW520-POLY is a dual ear (binaural) Polycom certified compatible headset.  Over-the-headset only headset with soft ear cushions.  HW520-POLY is unique with an ergonomic fit that is durable, lightweight, and comfortable for everybody in the office. Advance noise canceling technology and high quality audio ensures more focused and private calls, so conversations will be heard clearly. The design of the Plantronics HW520-POLY has metal joints that deliver durability and reliability, and a flexible mic with visual positioning guides for perfect position to your mouth.  HW520-POLY is ideal for telephone intensive users, such as Helpdesks or typical office employee.

Certified Compatible with Polycom Soundpoint IP phone models: 300, 301, 335, 430, 450, 500, 501, 550, 560, 600, 601, 650, 670, CX300, CX500, CX600, CX700, VVX 101, VVX 201 VVX 300, VVX 310, VVX 150, 250, 350, 450, VVX 400, VVX 410, VVX 500, VVX 600, VVX 1500

Key Features:

• Includes a Polycom certified RJ-9 bottom cable - connects directly to the "headset" jack of your Polycom phone.  No additional cable needed.
  Noise canceling microphone
• Plantronics QD (Quick Disconnect) allows walk away convenience
• Visual and tactile positioning guides enable precise and quick microphone positioning
• Wideband audio delivers richer, clearer conversations, while SoundGuard technology protects from noise spikes and listening fatigue
• Laser welded construction and metal joints provide unbeatable toughness Extraordinary Service
• Weight: 82g
• Plantronics 2-year warranty

For more detail information see Plantronics HW520 datasheet

Optional Plantronics HW520 parts & Accessories:

Plantronics EncorePro Headband Support Pad

Plantronics HW510, HW520 Foam Ear Cushions (qty 2)