TACTICAL SOUND CONTROL: Block impact noise with audio passthrough technology. TSC enables conversation and environmental awareness while suppressing percussive noises from ranges or other hunting and shooting related activities. Features passive noise isolation of 25 dB noise reduction rate (NRR). ALL DAY BATTERY: Features a rechargeable lithium-ion battery with up to 11 hours of battery life on a full charge. The included rechargeable battery pack can also be replaced with 3 AAA batteries to receive up to 22 hours of battery life. Uses Bluetooth 4.2 technology. CLEAR CALLS AT THE RANGE: Signature noise suppressing microphone with echo reduction technology help block percussive noise from firearms, air compressors, or hammers for clear calls in loud environments. BUILT TO LAST: IPX4 sweat and water resistance ensures that your hearing protection holds up in any conditions, with durable construction that is ready for any challenge.