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 BT 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 BT
Same Great Protection. Slimmer Fit. DEFY Slim BT is an ultra-comfortable electronic earmuff, featuring superior protection and environmental awareness. With active gunshot noise suppression, Bluetooth compatibility, and a background noise-dampening microphone, DEFY Slim BT 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
- 21 NRR tested and approved to ANSI s3. 19-1974.
- Bluetooth 5.0 connects, and dual-connects, devices 30+ feet.
- Lightweight Design at just 310 grams.
- Up to 25 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
- Noise-Isolating Microphone for clear communication in loud environments.
ISOtunes Sport DEFY Slim BT comes with 2 AAA batteries and an auxiliary cable.
Click here to learn more about Tactical Sound Control™.
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 BT 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 25 Hr Battery Life with 2 AAA batteries
- Noise-Isolating Microphone for clear communication in loud environments
Same Great Protection. Slimmer Fit.
Tactical Sound Control™
Tactical Sound Control™ uses digital circuitry to enable sound suppression in under 2 milliseconds. DEFY Slim BT cuts out loud noise to ensure safety in loud environments over extended periods of time.