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 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 BT
DEFY BT is a tactical earmuff that defies every assumption shooters have about painful and restrictive hearing protection. This modern take on a traditional style earmuff features next-generation technology, providing environmental awareness and gunshot noise attenuation.
- Tactical Sound Control™ Technology enhances your hearing up to 8x while protecting you from high-impact noises in under 2 milliseconds.
- Lightweight Design at just 15.5 ounces with a vented headband and memory foam ear cushions.
- Rechargeable Battery provides up to 11 hrs of connection to any device.
- AAA Battery Compatible for up to 22 hrs of connection (not included).
- Automatic Power Off after 4 hours for battery conservation.
- SafeMax™ Technology limits volume output to 85 dB for all-day, damage-free listening.
- Bluetooth 4.2 connects, and dual-connects, devices up to 30 feet.
- IPX4 Durability for sweat and water resistance.
- 25 NRR tested and approved to ANSI s3.19-1974.
- Noise-Isolating Microphone for clear communication in loud environments.
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.
Meet DEFY BT
Designed for shooters who want an over-ear electronic ear protector that allows them to take calls or listen to music all day long.


Product Features
This modern take on a traditional style earmuff features next-generation technology, providing environmental awareness and gunshot noise attenuation.
- Tactical Sound Control™ Technology enhances your hearing up to 8x while protecting you from high-impact noises in under 2 milliseconds.
- Lightweight Design at just 15.5 ounces with a vented headband and memory foam ear cushions
- Rechargeable Battery provides up to 11 hrs of connection to any device or use AAA batteries for up to 22 hrs of connection
- Noise-Isolating Microphone for clear communication in loud environments
Tactical Sound Control™
Tactical Sound Control™ uses digital circuitry to enable sound suppression in under 2 milliseconds. DEFY BT cuts out loud noise to ensure safety in loud environments over extended periods of time.