Suited for environments that require Class 1 Div 1 certification, intrinsically safe Model IS-SDP features optimized boom microphone, plus hard-wired earplugs and ear muffs for dual protection. Headset's 31 dB NRR combined with patented SENS™ technology allows operators to protect their hearing at safe level of 82 dB, communicate effectively between co-workers via 2-way radio and Bluetooth, and maintain 360-degree awareness.