This product contains Tactical Sound Control™ Technology. 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.TSC™ amplifies environmental sounds up to 8x, detecting hard-to-notice environmental sounds.
DEFY Slim will turn off TSC™ to stop the noise from relaying in your earmuff. After the environment returns to a safe listening level, TSC™ will turn back on and continue amplifying the sounds around you.





ISOtunes Sport
DEFY Slim
Same Great Protection. Slimmer Fit. DEFY Slim delivers superior protection in a no-frills, ultra-slim design. Tactical Sound Control™ allows you to hear and control ambient sound volumes, all while protecting you from harmful gunshot noises. DEFY Slim is the ultimate electronic earmuff for distraction-free, high-performance protection.
Please note: this product is not Bluetooth enabled and does not include a microphone for phone calls. If interested in a product with full Bluetooth functionality, see ISOtunes Sport DEFY Slim BT here.
- 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.
Warranty: All ISOtunes® products come with a 1-year warranty against defects in material and workmanship. The warranty does not cover damage by misuse, abuse or unauthorized modifications. We will provide a free exchange for customers who experience defective products within 12 months of purchase.*
Guarantee: Your satisfaction is guaranteed with a 30-day money back promise. If you are not completely satisfied with your product, please contact us within 30 days of purchase and we will prove a full refund**.
**Only items that have been purchased directly from ISOtunes.com can be returned to ISOtunes. ISOtunes products purchased through other retailers must be returned in accordance with their respective returns and refunds policy.

Product Features
DEFY Slim allows you to align your sights with ease without sacrificing your safety.
- Tactical Sound Control™ Technology enhances your hearing by 8x while protecting you from high-impact noises in under 2 milliseconds.
- Ultra-Slim Profile
- Up to 300 Hr Battery Life with 2 AAA batteries
Same Great Protection. Slimmer Fit.
Tactical sound control™
Tactical Sound Control™ uses digital circuitry to enable sound suppression in under 2 milliseconds. DEFY Slim cuts out loud noise to ensure safety in loud environments over extended periods of time.