• Tactical Sound Control™ Technology enhances your hearing by 8x while protecting you from high-impact noises in under 2 milliseconds.
• Ultra-Slim Profile
• 20 NRR tested and approved to ANSI s3. 19-1974.
• Lightweight Design at just 289 grams.
• Up to 300 Hr Battery Life with 2 AAA batteries.
• SafeMax™ Technology limits volume output to 85dB for all-day, damage-free listening.
• IPX4 Durability for sweat and water resistance

ISOtunes Sport DEFY Slim comes with 2 AAA batteries and an auxiliary cable.