I have 14 of these headsets for cordless phones or some cell phones. 10.00 each or all 14 for $20.00, it comes to $1.42 each. Various brands, ie: Seimens and Jensen.These were used to make Seimens cordless phones handsfree but will work with various brands including some cell phones. They work awesome. I am not sure but the jacks may work on desk phones as well. Take a look at the jack to make sure it will work for your application. The box of the Jensen sets say it's Noise-cancelling microphones with maximum clarity. The Jensen box also says: "Compatible with all cordless and cellular phones with a 3/32 in. (2.5mm) headphone jack.