The ADVANCE X-Vent BT Safety Helmet System has a Bluetooth® interface which allows the user to connect their smartphone or other wireless devices to the hearing protectors (noise reduction rating of 22). This not only gives you the convenience of listening to music, but also the safety of being able to make and receive phone calls. With a ratcheted easy-to-use wheel mechanism for sizing, a secure six-point head harness and an etched metal mesh visor, the non-vented helmet system provides outstanding adjustability and comfort. The ADVANCE X-Vent BT is a Type 1 (top of the head protection), Class ‘E’ rated (20,000 V electrical rating) Helmet System that meets both CSA and ANSI safety regulations.