【Wide Compatibility】 Phone headsets for office phones 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 full compatibility details, SEE COMPATIBLE PHONE LIST IN DESCRIPTION. ✘NOTICE：NOT for Cell phones and Computers】 | 【RJ9 Headset - Lightweight Design】 Designed with ultra-lightweight materials and soft breathable ear cushions, the telephone headset is 10%~30% lighter than other professional headsets. Its ergonomic design, including adjustable headband, ensures all-day comfort, even during extended conference calls. | 【Crystal-Clear Audio Performance】 Enjoy clear and precise conversations with our high signal-to-noise ratio speaker and independent cavity design telephone headsets. Microphone noise cancellation technology minimizes background noise, ensuring a richer, clearer audio experience. this rj9 headset also has acoustic shock protection function to protect your hearing. | 【Convenient Controls】 The headset features microphone mute and volume control, allowing for easy adjustment without interrupting your workflow. The 65-inch reinforced headphone cable provides flexible mobility, making it an ideal choice for busy professionals. | 【Durable and User-Friendly】 Designed for durability, our office phone headset features replaceable foamy ear cushions and is built to withstand the demands of daily office use. Its ergonomic design provides a snug fit and ensures all-day wearing comfort, perfect for business calls, making it an essential tool for business professionals. | ♥【Customer Support】 Rest easy with our RJ9 telephone headset support 45-Day replacement and return policy, ensuring shopping experience. Ideal for call centers, home offices, business, teleconferencing, telemarketing. Only available for landline phones with RJ9 headset connector. For other phones, please contact us for compatibility instructions.