TACTICAL SOUND CONTROL: Block impact noise with audio passthrough technology. TSC enables conversation and environmental awareness while suppressing percussive noises from gun ranges or other hunting and shooting related activities. Also features passive noise isolation of 26 dB noise reduction rate (NRR). ALL DAY BATTERY: ISOtunes Sport ADVANCE Features a lightweight rechargeable lithium-ion battery with up to 10 hours of battery life on a full charge. Certain to provide you with hearing protection for long sessions at the shooting range. Uses Bluetooth 5.0 technology. CLEAR CALLS AT THE RANGE: Signature noise suppressing microphone with echo cancellation technology help block percussive noise from firearms, air compressors, or hammers for clear calls in loud environments. BUILT TO LAST: Whether you’re at an indoor range, or out in the elements, ISOtunes Sport ADVANCE features IP67 rated protection against sweat, water, and dust. No matter your environment, ISOtunes Sport will hold up against the elements.