COMPATIBILITY ✅Yealink Desk Phones Series - T2x/T3x/T4xG/T4xS/T4xU/T5x/VP/Teams MP/SFB MP/Zoom-MP/Teams T5/SFB T5 ✅Poly - VVX x01/VVX x10/VVX x50 ✅AVAYA - 96xx/16xx/J1xx ✅SNOM - D3xx/D7xx/D8xx ✅Grandstream - GRP/GXP (Please check detail page) | Runs Right Out of the Box | A QD (Quick Disconnect) to RJ9 plug-and-play makes the connectivity to Yealink IP phones at ease. The phones can automatically optimize acoustic parameters for YHS office headsets, gives you optimized audio quality. | Ultra Lightweight Design | YHS34 Lite telephone headset is built for comfort with soft ear cushions and ultra-lightweight materials, the headset is 10%~30% lighter than other professional headsets in the same range. | High-Quality Audio Experience | Made for calls, YHS34 RJ9 is kitted out with a high signal-to-noise ratio speaker and independent cavity design. The passive noise cancellation creates a richer and clearer conversation with reduced background noise. | All Day Comfort | Designed with replaceable foamy ear cushions, the business headset can softly cover the ear and support long conference calls, the extremely lightweight design enables the phone headset all-day wearing comfortable without pressure.