SEE COMPATIBLE PHONE LIST IN DESCRIPTION. 【NOT for Cell phones and Computers】Direct connect landline telephone headsets ONLY Compatible with Some Specific Phone Models from ShoreTel Plantronics Zultys Toshiba NEC Aspire Dterm Nortel Norstar Meridian Siemens ROLM Packet8. Compatible with Polycom: SoundPoint 300 301 335 430 450 500 (rev. E or later) 501 550 600 601 650 670 CX300 CX500 CX600 CX700 VVX300 VVX310 VVX400 VVX410 VVX500 VVX600 VVX1500. FOR other phones, pls contact us for Compatibility Guide or Advice. | 【Calls made clear】All-new design headset for phones landline office engineered for greater productivity and natural sound delivery. Incorporates optimized wideband audio technology and noise cancelling mic to enable you enjoy a clear internet call freely. Acoustic Shock Protection Circuit to protect your hearing. | 【Tested Ergonomic Design】The rigorously tested ergonomic design providing all-day comfort. Ultra-soft, large protein earpads and adjustable headband distributes weight evenly, so it feels as comfortable on your last call of the day as it did on the first. | 【Convenient In-line Controls】Convenient inline volume and mute controls allows a more flexible listening experience. 5.3ft long cord offers flexibility to move around,designed to keep pace with the demands of work and life. | 【Built to last】: Arama A800S headset with precision design, quality plastics, durable and advanced. The new upgraded appearance brings you a different experience.