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, and Polycom models: 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. 【High Sound Quality】Telephone headset with wideband Sound provides a natural listening experience, features Noise Canceling Microphone to reduce the noise of background, Acoustic Shock Protection Circuit to protect your hearing. 【All-Day Comfort】Office telephone RJ headset with Super lightweight desight, features an adjustable headband to fit all head sizes, soft and high quality leatherette ear cushion enhance all-day wearing comfort. 【Super Durable】Superior quality microphone, precision design, unibody headband construction, quality plastics makes this call center headset more durable and sturdier. Compete with Plantronics or Jabra heavy duty Phone Headsets for Call Center, Telemarketing & Office. 【Plug and Play】This call center headset is easy to set up, connecting to various landline desk phones right out of the box. Professional-Grade Phone Headphone for Polycom IP-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. Engineered for exceptional sound quality, all-day comfort, and dependable performance, this phone headphone is the perfect audio solution for remote professionals. This headset for phone is designed to meet the needs of demanding environments, it’s ideal for roles in call centers, telemarketing, customer service, and online business meetings. Rest assured, your purchase is protected by our 2-Year Warranty and dedicated customer service, ensuring a completely worry-free experience.