• Bluetooth 5.2 with a range of up to 9 meters
  • SafeMax™ technology (limited volume 85 dB)
  • Sound insulation value 32 dB SNR


CALIBER – The ultimate True Wireless Bluetooth hearing protection for shooters

Designed specifically for hunters and shooters, the ISOtunes CALIBER hearing protection allows you to connect wirelessly to a variety of devices: Earphones for listening to music or talking on the phone when you want to, amplification like a hearing aid when it makes sense for you and hearing protection exactly when you need it.




Protect yourself against harmful rifle shot noise, typically reaching 150-170 dB, risking hearing damage. SafeMax™  technology limits noise to a safe 85 dB for an enjoyable, risk-free shooting experience.





Included is a charging case with USB-C charging cable (charging current max. 5V/1A). The battery life of the hearing protectors is up to 13 hours on a single charge. Energy-efficient auto power off after 2 hours without Bluetooth connection. The charging time is about 2 hours and the standby time is about 60 hours.


Additional information

Active Technology

The ISOtunes CALIBER is specifically designed for hunters and shooters who require hearing amplification for improved performance and safety in combination with electronic hearing protection. Tactical Sound Control™ (TSC) technology improves hearing by up to 8 times while protecting against extreme impulse sound in less than 2 milliseconds. Sound level-dependent technology actively channels natural, safe sounds through the product, while suppressing harmful gunshot sounds. TSC™ enables hunters and shooters to communicate, hear instructions or calls, and eavesdrop on wildlife.


Our 60 Shore silicone is flexible, soft and highly robust. Color: transparent | glossy

Key Features:

  • Sound insulation value 32 dB SNR
  • SafeMax™ technology (limits sound volume to 85 dB)
  • IP67 certified for dust, sweat, and water resistance
  • Bluetooth 5.2 with a range of up to 9 meters
  • Up to 13 hours of battery life
  • Tested according to the European safety standard EN 352-2:2020 and approved according to the PPE Regulation (EU) 2016/425

Note: Avoid using the product in areas where magnetic earplugs might accidentally attach to or come into contact with mechanical equipment, such as machinery.


Custom-Made Earplugs for ISOTunes SPORT Caliber

The custom-made earplugs for ISOtunes SPORT CALIBER are precisely tailored to the shape of your ear using an impression. If you are looking for a perfectly fitting ISOtunes hearing protection, our HASPRO plugs are just right for you. Due to the individual fit to your ears, they ensure a secure and comfortable fit and allow for optimal wearing comfort.

The use of 100% biocompatible material ensures a comfortable wearing experience with no pressure, no sweating, and no feeling of being closed off.

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