Jabra PRO 920 Mono Wireless Headset for Deskphone Crystal clear sound - digital signal processing (DSP) in Jabra Audio devices will remove background noise and echo as well as protect the user against sudden high peaks in volume. Wireless freedom up to 300ft Noise canceling microphone reduces unwanted background noise and the Noise-canceling microphones reduce unwanted background noise and are ideal in crowded and noisy, open office environments. Peak stop technology immediately removes potentially Harmful loud sounds or tones before they reach your ears Keeps the sound level within the safe range to protect your hearing