... microphone, 3.Monaural type 4.With QD Professional Call center RJ headset Main Features:1. Lightweight & comfortable, free stretching headband,2 ... Frequency range: 200~4000HZ Distortion: ≤5% Sensitivity: 98±3dB (1000,1200,1500,2000HZ);c. Cable and connector Durable, low interference cable ...