Champion Vanquish Pro Elite Electronic Muff DEMO-B. It’s the first hearing protection in the shooting sports with active noise cancellation, featuring sound compression technology and less than one millisecond reaction time. The Bluetooth-enabled, omnidirectional microphones and HD speakers deliver crystal-clear, natural sound. Acoustic foam keeps you comfortable through extended shooting sessions. Plus, rechargeable lithium-ion batteries deliver 12 hours of run time. Safe Level Sound Compression Technology. Lithium Ion Rechargeable Batteries Included. 2 Full Dynamic Range High Definition Speakers. 12-Hour Runtime with Lithium Ion Rechargeable Batteries. 3 Hour Automatic Shut-Off. Acoustic Foam for All Day Comfort. Yes – 3 hours. 12 hours with Bluetooth, 100 hours without Bluetooth. 2 full dynamic range HD. 2: Gray & Burnt Bronze.