I was looking at a hands free headset for home use, when I purchased the CS 55. It was not clear that you needed a PSTN adaptor if you want to use it in a home environment. (with cordless phones).I was able to find the right plantronics adaptor an it is working fine at home, I later discovered that there is a CS-55H Home edition, but for me it was more practical to purchase the adaptor than to ship back the CS 55 and pay for shipment again for the CS 55H.my wife complaints that the range is not as wide as I thought, but I have not played with the adjustments yet.