• ANR — Active noise cancellation over a broad range of low frequency noise bring state of the art technology to Sierra.   
• Comfort and Durability — At 16 ounces with plush ear seals and solidly designed ear cups, extended wearing is a breeze.
• Bluetooth Connectivity — Allows wireless connection from Bluetooth phones. Stereo streaming (A2DP) is not available with Sierra.
• Music Connection — An integrated control box input allows you to connect a music player.
• ComPriority — Receiving radio communications is a snap with ComPriority, which automatically decreases music player volume by 80 percent, lessening the chance of missing important interactions.
• Power Source and Connectors — Two AA batteries, Dual GA.
• Accessories — Carrying case, music patch cord, cord clip, foam wind screen.