1.Bone--transport microphone transmittes high-clear voice
2.Velcro hasp adjusts the length of headband conviniently and safely
3.PTT enjoys a large area of operation and good texture, adopts the IP57
4.Convinient Nexus plug guarantees high safety
5.RJS--B Skull-Vibration Transmitter can be widely used by the firefighters, miners, emergency rescurers and anti-chemical rescurers with the helm and mask.