The 3M™ Peltor™ WS LiteCom Plus earmuff is a high-performance hearing protector with a built-in communication radio for cable free short-range communication with other LiteCom Plus headsets and portable two-way radios programmed on the same frequency. The noise cancelling speech microphone with VOX functionality enables you to communicate hands free in noisy environments. Bluetooth® multipoint-connectivity. SNR: 33dB. In accordance with: EN 352-1