THE LEFT EARBUD OF THIS HEADSET IS NOT WORKING. The right earbud, microphone, and pushbutton all work. The headset has a 3.5mm TRRS (4 contact) plug suitable for many cell phones. (It works with my Samsung Gusto 3 flip phone, which apparently uses the CTIA pinout.) Pick up at our house in Derwood, between Rockville and Gaithersburg (near Briardale Road). [f]