3M™ PELTOR™ WS™ ALERT™ X Headset is a Bluetooth® headset with noise-cancelling boom microphone that connects to your mobile phone for hands free calls and streaming in noisy environments. The headset has a level-dependent function for ambient listening, and it syncs to a mobile app so users can easily set-up and adjust the headset* Attenuating hearing protector comes in two models: headband or a safety helmet attachment (MRX21P3E4WS6)* Bluetooth® technology for connection to an external Bluetooth® device allows for hands-free talking and streaming* Noise-cancelling boom microphone for clear speech transmission in noisy environments* Level-dependent function for ambient listening to help promote auditory situational awareness* Connection to an iOS and Android compatible mobile app, 3M™ Connected Equipment, to more easily set-up and adjust the headset. The app is available to download from App Store and Google Play.* Mobile app allows you to receive reminders when to change replacement cushions (hygiene kit) and choose the frequency of these alerts* Replaceable cushions (hygiene-kit) and replaceable covers so you can change to your own choice of colour* Push-to-Listen feature to listen to your surroundings easily and instantaneously* Voice guided feedback after setting adjustment. No need to remove the headset for any adjustments* The headset will automatically turn off after four hours of non-use to save battery life* 2 x AA Alkaline Batteries (or optional NiMH rechargeables)* Operating time: Approx. 78 hours (Bluetooth® streaming and level-dependent)SNR 30 dB