Look Ma, No Hands!
Our phone headsets all have swing-up mics with a windscreen, adjustable headbands and padded ear-pieces. The 4-foot cords terminate in a 5-pin DIN plug. (Orienting the plug with the pins on the bottom, the two left pins are 35-ohm, probably for the speaker; the middle pin is not active; and the two right pins are 2K, we think for the mic.) You pick the left-ear set or the adjustable set, which will fit either left or right ears.