N/X Telephone Headset with Noise Cancelling Mic Compatible with Cisco IP Phones 7931 7940 7941 7942 7945 7960 7961 7962 7965 7970 7975 and More

So far works great. The adapter fits the plug at work so I just plug it in and have my own headphones. It comes with a bunch of different adapters so it seems like it would fit a huge range of phones, and the price is amazing.