Can you use Bluetooth while using TSC? Do you have to use Bluetooth to be protected? You can use both Bluetooth and TSC at the same time. TSC enables conversation and environmental awareness while suppressing percussive noises from ranges or other hunting and shooting related activities. BLUETOOTH CONNECTIVITY: Seamlessly connects to your phone, computer, or tablet for easy on the go use and control of your music or phone calls. Uses Bluetooth 4.2 technology. ASG AEG PL Steyr AUG A2 Tan Airsoft Rifle ISOtunes Sport DEFY BT Tactical Earmuffs with Bluetooth, 25 NRR (EA1... ULTRX Bionic Fuse Bluetooth Earmuff - Ear Safety - Hearing TSC volume can be turned up, down, or off from the right earcup. The included rechargeable battery pack can also be replaced with 3 AAA batteries to receive up to 22 hours of battery life. Peltor Hearing Protection ISOtunes Sport DEFY Shooting Earmuffs Rechargeable Bluetooth Hearing Protection Bluetooth Earmuffs The battery can be removed and replaced with AAA batteries for extra hours of battery life. TACTICAL SOUND CONTROL: Block impact noise with audio passthrough technology. What is Tactical Sound Control? Can it be turned on/off? TSC is a level-dependent technology that uses omni-directional microphones to allow safe sounds to actively pass through the product while blocking harmful gunshot noise. 1 Hearing Protection 2 Hearing Amplification 3 Bluetooth 4.2 4 Water Resistant 5 All-Day Battery Life What size are these earmuffs? ISOtunes Sport DEFY BT earmuffs have an adjustable headband and are designed to fit head sizes ranging from small to large.