The "TUFFTALK M" helmet offers hearing protection while allowing you to communicate on noisy construction sites. For safety reasons, an open line of communication is required in many workplaces. The ability to respond without having to press a button is a benefit, especially for workers who work with heavy equipment. The TUFFTALK M has full-duplex technology, which allows staff to talk hands-free. SENA's MESH is a network that optimizes itself, always looking for the best connection. The helmet offers two MESH modes: OPEN MESH and GROUP MESH. The former allows an almost unlimited number of users who can connect to each other within an effective range of 1.1 km. For private sessions, the second is more suitable and supports up to 24 participants. Also available in a version to be attached to a hard hat.