CAST combines certified over-ear hearing protection with Sena's most functional jobsite communication features. Connect multiple CAST headsets over Sena's proprietary Mesh network at the push of a dedicated button, extending to a range of up to 1.1 km when small groups are connected, and up to 4.4km when a minimum of 6 users are linked on the same Mesh channel. CAST also features a built-in PTT button for two-way radio via cabled or wireless (Bluetooth), a button for convenient microphone muting, two volume control buttons (+ and -) and well as a button to activate ambient hearing capabilities. CAST's versatilty allows it to be worn as over-the-head headset, or mounted directly to a hard hat using the included saftey hat mounting kits (supplied in two designs).