This product is designed, manufactured, labeled, and packaged for sale to industrial and professional customers for workplace use; it is not intended for consumer sale or use Hearing protector with built-in analogue two-way communication radio Available in 16 channel PMR 446 MHz version with 121 sub-channels Level-dependent technology helps improve situational awareness and communication Noise cancelling dynamic microphone provides voice-operated transmission for hands free use External connection jack allows connection of a mobile device or another two-way radio Lithium-Ion battery Auto power off and clear battery status indication Available in headband and helmet mounted models Use to help you communicate efficiently in high noise environments