Bluetooth® 4.1 connectivity allows you to keep your protective hearing earmuff on and your hands free while talking on the phoneStreaming music wirelessly via Bluetooth® keeps your phone safe in your pocket and eliminates potentially dangerous cordsVolume Management Technology limits output volume from portable audio devices to 82 dBPatented Air Flow Control Technology provides optimal noise reduction across all frequencies without increasing earcup size or weightBoom microphone outputs crystal clear audio while talking in noisy environments, and rotates easily out of the way when not in useThe premium headband features a tough steel core for added durability and longer earmuff lifespanEarcups are cushioned and steel headband is padded for long-wearing comfort on the jobRechargeable battery lasts 16+ hours at highest usage i.e. active calling/streaming (often 20+ hours in first 1-2 years)USB charger with wall adapter3.5 mm AUX cable