The CavCom two-way communication system for high-noise environments uses “Talk Through Your Ears” technology to provide radio users with superb clarity in conjunction with any PPE including respirators. Offering 29 NRR, the intrinsically safe system allows workers to stop removing earplugs to communicate. CavCom consists of a control unit, radio adapter, ear set and hand-held two-way radio. CavCom, Walker, MN.