Equipped with wideband speakers and noise-canceling microphone, MKJ920BT wireless telephone headset delivers crystal clear sound for the conference calls. It compatible with mainstream Bluetooth enabled devices, such as computers, laptops, mobile phones, tablets etc... It works well on Skype for Business, Microsoft Teams, Zoom Meetings etc UC platforms. Specifications Microphone Microphone: Directional noise reduction microphone (Acoustic noise canceling structure)Mic Sensitivity: -38dB±3dBCrystal clear sound and voice(DSP) Speaker Wideband Speaker Frequency: 20Hz-20KHz.Distortion: ≤1%Sensitivity: 118dB±3dB QCC 3024 V5.1, dual mode, downward compatible Frequency Range: 2.4GHz-2.48GHz Support Protocols: A2DP, AVRCP, HFP, AAC, etc. Transmission distance: up to 30 meters Pair with 2 Bluetooth devices simultaneously