Office Phone Headset[Call Center], TelPal Hands-Free Noise Cancelling Corded Headset for Telephone Counseling Services,Banks,Enterprise Best Phone Headset With Phone Jack:4-pin RJ9 connector, for telephones/phone use only, cannot for mobiles, computers or PC. Telephone headsets for office/home landline phones: Perfect for working at home & office for job of sales, call center, phone marketing, online education, trainning, after sale service, to free hands from work; Superior quality and clear voice sound with the flexible adjustable noise cancellation microphone.Hearing protection technology adopted for care of the user's hearing. A comfortable noise cancelling headphones with mic and adjustable: compact appearance,soft ear cushion, human engineering design, Can be uninterruptible using. The headset clip can be stretched freely and comfortable wear. Fantastic customer service experience. Full refund if it doen't work or you just dont like it. It is really a nice office rj9 headset for desk phone to improve your work efficiency. Warm Tips - This headset is Compatible with Most Regular Telephones with RJ9 Connector, 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 VVX601, Polycom VVX310, Nortel, ESI Phone System, momentum telecom telephones,Panasonic KX-TS15-W and a Radioshack, Samsung phones LCD 12b keyset DCS and cordless phones.