This is the Plantronics HW540-SPA headset. Design for the Cisco SPA models SPA 303, 5xx, 9xx Phones.  HW540-SPA comes with three (3) different headset design (over-the-headset, over-the-ear, behind-the-neck).  So you can never go wrong buying this headset.  Plantronics HW540-SPA is designed with quality and for all day comfort.  All 3 styles is simple to convert and is secure to wear with any style you choose. The Plantronics HW540-SPa provides high--quality audio, a flexible microphone with easy to change positioning, soft ear cushions, and super durable and lightweight materials for all day comfort.

Cisco Certified to work with Cisco SPA models:  SPA 303, SPA501G, SPA502G, SPA504G, SPA508G, SPA509G, SPA512G, SPA514G, SPA525G, SPA525G2. SPA921, SPA922, SPA941, SPA942, SPA962.

Key Features:

• Includes a Cisco certified 2.5mm 10ft adapter cable - connects directly to the "headset" jack of your Cisco phone.  No additional cable or adapter needed.

• 3 wearing styles - over the head, on the ear, and behind the head.

• Plantronics Quick Disconnect (QD), can also be used with other devices such as computer, or smart phone

• Noise canceling microphone

• Wideband audio delivers clear conversations

• Designed for heavy call center environments

• Laser welded construction and metal joints provide unbeatable toughness Extraordinary Service

• 2-year warranty

For more detail information see Plantronics HW540-SPA datasheet

Plantronics HW540-SPA optional parts:

Plantronics HW540 Ear Loops (small and large)