Got it from work and opened it only to realize it only works with conference phones and not pcs.

The Poly CS540 DECT Wireless Single Ear-Hook Headset with Boom Mic is a sleek and modern telephone headset designed for home use. With a comfortable ear-hook form factor and a built-in microphone, this headset provides convenience and ease of use. The DECT wireless technology ensures clear sound quality, while the RJ-9 base connectivity makes installation simple. The black color and modern design add a touch of style to any home telephone setup. This headset is a reliable and high-quality option for those looking for a user-friendly communication device.