Telephone Headset, PChero Noise Cancelling Headset with Mic for Call Center, Desk Telephone, Perfect for Phone Sales, Insurance, Hospitals, Telecom Operators - [Binaural] RJ9 VERSION Binaural Headset - It Comes with a 4-Pin RJ9 Connector which is Only for RJ9 Landline Telephone Use, Not Compatible with 2.5mm or 3.5mm Plug. WORK MORE EFFICIENT - Keep Your Hands Off Your Phone while Calling, You can increase Productivity by Working on Your Telephones, Taking Notes, or Handling other Tasks. HUMAN ENGINEERING DESIGN - Hands-free Lightweight Headset which makes it Look Compact Appearance and Comfortable to Wear. TRY WITH THE HEADSET ADAPTER IF NOT WORK - If you found the headset or the microphone is not work with your phones, We Suggest you use the 8 Channels Adapter which is compatible with Most Telephones in the World. EMAIL US First BEFORE RETURN - This headset is Compatible with Most Regular Telephones with RJ9 Connector, but it will be not compatible with some telephones not known by us. If the Headset or Microphone is NOT WORK with Your Telephones, please Email us for Further Help by Telling us Your Phone Brand and Model number. Incompatible Model: Polycom VVX310, Nortel, ESI Phone System, momentum telecom telephones,Panasonic KX-TS15-W and a Radioshack, Samsung phones LCD 12b keyset DCS.