Sonis Comms Headband Ear Defenders is a powerful communication tool, providing group intercom and active hearing protection for safe network • embedded DMC (Dynamic Mesh Communication) technology creates an autonomous private network for seamless team communication • user-friendly and intuitive to operate via ergonomic buttos on the earcups • hands-free technology • desktop configuration tool, and JSP Comms mobile app. • comfort and design features with cutting-edge wireless technology to deliver the ultimate protection • continuous connection for up to 9 hours of work • battery type: rechargeable Li-ion, 2000mAh, 3.7V, 7.4Wh • IP54 rating