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ISOtunes | iso-sport-caliber
18

ISOtunes Sport CALIBER True Wireless Earphones w/ Bluetooth (NRR 25)

Sale price$329.95

Why you'll love it:

  • Attenuation (NRR) of 25dB
  • Up To 39 Hours of Total Battery Life
  • Rugged & Sweatproof
  • Crystal-Clear Calls in Loud Environments
  • Enhances Hearing While Blocking Gunfire
  • Earplugs with audio!
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Key Features

25 dB of Noise Reduction

Most gunshots will register between 150 - 170 decibels. At those levels, hearing damage can occur quickly. Combat those dangerous noise levels and shoot safely all day long.

IP67 Durability

Tough on gear? Now you don't need to worry. CALIBER BT is completely waterproof and dust-tight, and all ISOtunes Sport products are backed by a 1-year warranty.

Ear Protection that Doesn't Look or Feel like Ear Protection

Earbuds when you want it, hearing aids when you need it, and a hearing protector when you least expect it.

Description

The Freedom You Want. The Protection You Need.

CALIBER is a Bluetooth shooting earbud that packs a big punch in a little package. This electronic ear pro protects against dust, sweat, and water and can run up to 13 hours without needing to be recharged. The completely cordless design allows you to move freely while Tactical Sound Control™ delivers amplified natural sound and gunshot noise reduction.

Tactical Sound Control

TSC™ level-dependent technology allows safe sounds to actively pass through the product while blocking harmful gunshot noise. TSC™ protects hunters and shooters while giving them the ability to communicate, hear range commands, and listen for game.

25 dB of Noise Reduction

Most gunshots will register between 150 - 170 decibels. At those levels hearing damage can occur quickly. Combat those dangerous noise levels and shoot safely all day long.

IP67 Durability

Tough on gear? Now you don't need to worry. CALIBER is completely waterproof and dust-tight. Plus all ISOtunes Sport products are backed by a 1-year warranty.

Key certifications:

NRR 25

An NRR of 25 means that the hearing protection is estimated to reduce noise levels by an average of 25 decibels across various frequencies.

'NRR' in hearing protection stands for 'Noise Reduction Rating,' which is a single value used to indicate the average level of noise reduction a hearing protection device provides across different frequencies, essentially telling you how much sound attenuation the earplugs or earmuffs will offer when worn correctly; the higher the NRR value, the greater the noise reduction level is considered to be.

NRR is primarily used as a rating system in North America, while Europe often uses 'SNR' (Single Number Rating) and Australia/New Zealand use 'SLC80'; which both differ slightly in calculation.

Tech Specs

Material
IP67 sweat, water, dust resistant earbuds
Made with silicone components
Foam and silicone ear tips
Lithium ion batteries
Electical components
Fit
Customizable fit: Includes multiple ear tip sizes (foam and silicone) to suit a variety of ear shapes and preferences.
Weight
15g (both earbuds)
50g (case)
For Kids
Not designed for children
Microphone
Yes, allows for communication during phone calls or team interactions.
Attachable boom-mic for enhanced clarity in loud environments available seperately.
Certified For
Australia & NZ (SLC80): No
USA (NRR): Yes
EUR (SNR): No
Charging Port
USB-C

Attenuation Details

Frequency (Hz) 125 250 500 1000 2000 4000 8000
Mean Attenuation (dB) 28.5 31.8 34.9 34.6 33.4 40.2 45.2
Standard Deviation (dB) 4.2 4.0 5.1 5.1 3.6 4.6 3.5
APV (dB) 24.3 27.9 29.8 29.6 29.8 35.8 41.7

In the Box

  • 1x Caliber BT Earbuds
  • 1x Protective Charging Case & Short Lanyard
  • 1x USB-C Charging Cable
  • 1 Pair of Silicone Triple Flange Eartips
  • 3 pairs of Short Trilogy Eartips (S,M,L)
  • 3 Pairs of Tall Trilogy Eartips (S, M, L)

Product Care

  • Clean earbuds with a damp cloth and mild soap if needed.
  • Do not submerge in water or use abrasive cleaning solvents.
  • Foam eartips should be replaced every three months or when soiled.
  • Store in a clean, dry place between -20°C and 50°C.
  • Avoid exposure to chemicals like bug spray and sunscreen.
  • Do not fully discharge the battery before long-term storage.
  • Ensure the hearing protector is properly fitted and maintained.

Instructions

Fitting

  • ISOtunes Sport CALIBER includes TRILOGY™ foam eartips in three sizes (S, M, L).
  • Select the size that provides the most secure fit in your ear canal.
  • Compress the foam eartip by rolling it between your fingers.
  • Insert the eartip deep into your ear canal and hold in place for 5 seconds to allow expansion.
  • Adjust the earbud slightly to secure it in the ear.

Power On/Off

  • Power On: Open the charging case; earbuds will turn on automatically.
  • Power Off: Place the earbuds back in the charging case and close the lid.

Alternative Method:

  • Power On: Hold the right earbud's touch surface until you hear "Power On."
  • Power Off: Hold the right earbud's touch surface for 5 seconds until you hear "Power Off."

Bluetooth Pairing

  • Open Bluetooth settings on your device.
  • Press and hold the right earbud's touch surface until you hear "Bluetooth Pairing Mode."
  • Select "ISOtunes Sport CALIBER" from the device list.
  • Once connected, you will hear "Bluetooth Connected."

Tactical Sound Control™

  • TSC allows users to hear ambient sounds while maintaining safe hearing levels.
  • The left earbud touch surface adjusts TSC volume:
  • Single tap: Increase volume.
  • Double tap: Decrease volume.

Charging

  • Insert earbuds into the charging case.
  • Red LED = Charging
  • Blue LED = Fully Charged
  • Charging voltage should not exceed 5V.

Music Controls

  • Play/Pause: Single tap on the right earbud.
  • Next Track: Double tap on the right earbud.
  • Previous Track: Triple tap on the right earbud.

Phone Calls

  • Answer/End Call: Single tap on the right earbud.
  • Reject Call: Hold right earbud touch surface for 1 second.

Siri / Google Assistant

  • Hold the right earbud's touch surface for 1 second to activate voice assistant.

Frequently Asked Questions

Take a look at our most frequently asked questions for the ISOtunes Sport CALIBER True Wireless Earphones w/ Bluetooth (NRR 25). If you have any further questions, get in touch here.

Reviews

3.7
Rated 3.7 out of 5 stars
Based on 18 reviews
Total 5 star reviews: 8 Total 4 star reviews: 5 Total 3 star reviews: 0 Total 2 star reviews: 2 Total 1 star reviews: 3
72%would recommend this product
ProtectionRated 4.4 on a scale of 1 to 5
QualityRated 4.1 on a scale of 1 to 5
ComfortRated 3.9 on a scale of 1 to 5
18 reviews
  • MP
    MARK P.
    Flag of Australia
    Verified Buyer
    I recommend this product
    Age Range 55 - 64
    Gender Male
    Used For Shooting
    Rated 5 out of 5 stars
    2 weeks ago
    The Best

    use for sport and work a treat no issues at all would recommend sound buy

    ProtectionRated 5.0 on a scale of 1 to 5
    QualityRated 5.0 on a scale of 1 to 5
    ComfortRated 4.0 on a scale of 1 to 5
  • TT
    Terry T.
    Flag of Australia
    Verified Buyer
    I recommend this product
    Age Range 45 - 54
    Gender Male
    Used For Shooting
    Rated 5 out of 5 stars
    5 months ago
    Excellent service

    I purchased the wrong product, contacted the team for exchange and they were extremely helpful. They exchanged the product straight away and couldn't have been more accommodating. Thanks very much!

    ProtectionRated 4.0 on a scale of 1 to 5
    QualityRated 5.0 on a scale of 1 to 5
    ComfortRated 5.0 on a scale of 1 to 5
  • P
    P
    Flag of Australia
    Verified Buyer
    I recommend this product
    Age Range 35 - 44
    Used For Shooting
    Rated 5 out of 5 stars
    1 year ago
    Headache-free sports shooting

    These earphones have positively improved my pistol shooting experiences. I was getting headaches from over-ear muffs and looked for an alternative that was in a good price range, but I felt would properly protect my ears.

    It took some fiddling to get used to the controls, and to find the right level of sensitivity for different situations for me. However, now that I have, these earphones are fantastic.

    The battery life is excellent, I have protection at the same time as being able to hear conversations around me, and I wear them for hours at pistol club without discomfort. They came with a wide range of ear inserts, which also made it easy to work out what was most comfortable for me.

    I recommend taking the time to make these work for you. I do find that I turn the sensitivity up and down depending on the situation. For example, on very windy or rainy days I turn them down because otherwise I can’t hear people talking. But the touch controls make it all very easy.

    ProtectionRated 5.0 on a scale of 1 to 5
    QualityRated 5.0 on a scale of 1 to 5
    ComfortRated 5.0 on a scale of 1 to 5
  • AR
    Andrew R.
    Flag of Australia
    Verified Buyer
    I recommend this product
    Age Range 35 - 44
    Gender Male
    Used For Shooting, Hunting, Exercising
    Rated 5 out of 5 stars
    1 year ago
    Does what it says on the label!

    After some playing around with the controls and getting the right fit for my ears, I found these to be just what I needed!

    The range of interchangeable tips allow for a good, solid fit. Having the triple flange ear tips is a bonus as when I’m not at the range I use these for a more comfortable fit for listening to music and taking calls while in the yard, travelling and exercising. I did try these tips while shooting and while effective, just not quite as good as the foam tips as they provide a slightly better seal (for my weirdly shaped ears). Some might say that having 2 sets of tips is inconvenient but I just keep the foam ones in my range bag.

    So far I’ve had no Bluetooth connection issues (iPhone 13). Phone calls are clear on both ends, and music quality is pretty good - just be aware that you cannot change the call or music volume with them as you will need to do that through your phone. The tap controls take a little to get used to but work okay for me. They pair with your phone within moments of opening up the recharging case.

    Whilst I haven’t done any hunting with them yet, the Tactical Sound Control works rather well. Whilst at the range I have had them on their lowest setting and can hear range commands clearly, and I can even hear people chatting on distant ranges! Even a light plane flying overhead sounded like it was in the car park! You can turn this setting off and it sounds/feels like you are wearing regular ear plugs. As for sound suppression, I have no…

    ProtectionRated 5.0 on a scale of 1 to 5
    QualityRated 5.0 on a scale of 1 to 5
    ComfortRated 5.0 on a scale of 1 to 5
  • BR
    Benjamin R.
    Flag of Australia
    Verified Buyer
    I recommend this product
    Age Range 25 - 34
    Gender Male
    Rated 5 out of 5 stars
    2 years ago
    Great product, brilliant customer service.

    These things are a great bit of work kit. I use large mowers, brushcutters and other noisy equipment at work and these earbuds mean I can protect my hearing as well as enjoy music or an ebook as I work. The situational awareness feature is cool, meaning that if I'm performing a task which doesn't use power tools I can listen to music and the birds in the garden at the same time!

    I had some problems with my first pair of earbuds, but the team at Earjobs were prompt and professional and sorted everything out hassel free.

    A happy customer.

    ProtectionRated 5.0 on a scale of 1 to 5
    QualityRated 4.0 on a scale of 1 to 5
    ComfortRated 4.0 on a scale of 1 to 5

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