The ISOtunes Sport DEFY BT Electronic Shooting Earmuffs defy every assumption users have about painful and restrictive hearing protection. This modern take on traditional-style earmuffs feature next-generation technology, providing environmental awareness and gunshot noise attenuation. Tactical Sound Control Technology enhances your hearing up to 8 times while protecting you from high-impact noises in under 2 milliseconds. SafeMax Technology limits volume output to 85dB for all-day, damage-free listening. Noise-isolating microphone offers clear communication in loud environments. Lightweight, foldable design at just 15.5 oz. with a vented headband and memory-foam ear cushions for comfort. 25 NRR tested, approved to ANSI s3.19-1974, and features IPX4 sweat- and water-resistant rating. Bluetooth 4.2 connects and dual-connects devices up to 30'. Automatic Power Off after 4 hours for battery conservation. Included rechargeable battery powers the muffs for up to 11 hours. Optional AAA batteries (not included) power them for up to 22 hours. These earmuffs for shooting include a microUSB charging cable. Tactical Sound Control Technology enhances your hearing up to 8 times Protects against high-impact noises in under 2 milliseconds SafeMax Technology limits volume outputs to 85dB Noise-isolating microphone Light, foldable design with vented headband and memory-foam ear cushions 25 NRR tested Approved to ANSI s3.19-1974 IPX4 sweat- and water-resistant rating Bluetooth 4.2 connects and dual-connects devices up to 30' Automatic Power Off after 4 hours