Yealink YHS34-DUO Lite, Entry-level RJ9 headset, Binaural, Foam. Designed with replaceable foamy (YHS34 Lite) ear cushions, the business headset can softly cover the ear and support long conference calls, which keeps you enjoying supreme comfort all the time. Made for calls, YHS34 Lite is kitted out with a high signal-to-noise ratio speaker and independent cavity design.