Review on Plantronics 38541 02 Headset Cable by Sarah Smith

Works great for phone calls. The button also performs different functions depending on what the phone is doing (music, calls, etc.). Plugs directly into the headset cable, no amplifier required. As mentioned in other reviews, this isn't really meant for music as older Plantronics headsets are meant for voice. However, the voice quality is excellent. Update: Tested on my Lenovo T430 with headphone/mic combo jack. You can call the softphone or just listen to audio on it. Not sure if the L/R channels will be mixed to mono or if I'll just get one channel. The sound is very clear for listening and speaking.