Noise Reduction Ratio (NRR)
An indicator of how much volume in decibels tactical headphones cut during operation. Acoustic efficiency NRR (Noise Reduction Rating) is the sound absorption characteristics according to the requirements of the American quality standard. A similar standard in the European style is called SRR (about it, see above).
NRR is an assessment of how effectively a hearing protection device can reduce ambient noise levels. If headphones are marked with the “NRR 30 dB” mark, then they can reduce the level of external sounds by 30 dB. The higher the NRR value, the more effective the tactical headphones are at protecting the hearing aid.
Noise level limit
The maximum permissible sound pressure level that can reach the user's ears. Noise limits are necessary to protect the hearing aid from excessively loud sounds (gunshots, explosions, etc.). The limiting function is automatically activated when the sound pressure reaches a set limit to reduce or block the signal before being transmitted directly to the user's ears. Blocking loud sounds is achieved either by built-in electronics or by closing sound-conducting channels - the specific implementation of the function depends on the model of active tactical headphones.
Reaction time
Headphone response time to changes in the sound environment. This parameter refers to the interval between the time the noise level exceeds a safe hearing level and the response of the headphones when the external sound is reduced to a safe level. Fast reaction time is important to ensure an immediate protective response to external threats (shots, explosions, etc.).
Operating time
Operating time of the headphones on one set of replaceable batteries or a full charge of the built-in battery (see “Power source”).
Using this parameter, you can roughly estimate the duration of use of tactical headphones without the need to replace batteries or recharge the power source. It is also intended to compare the real capabilities of different models.
Auto switch-off
Automatic shutdown is intended to save battery power or the built-in battery of tactical headphones. The
auto-shutdown feature may be based on failure to detect sounds or activity through built-in sensors or detection algorithms. In another implementation, the headphones automatically turn off after a set time of inactivity, and you can return them “to life” by pressing any button or turning the analogue control (see “Control”).
In the box
Additional equipment included with tactical headphones.
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Case. Case for storing and transporting headphones. Cases are soft fabric cases: they protect the device from dust, moisture and dirt during storage and transportation. The cases are also used to store additional items such as a charging cable or replacement batteries.
— Batteries. Replacement batteries of standard size for tactical headphones with appropriate power supply. This configuration allows you to use the device “out of the box” without purchasing additional energy sources. Note that the kit usually includes elements in the form of disposable batteries, and not rechargeable batteries.
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Audio cable. The standard equipment includes a special cable that can be used to connect tactical headphones to various audio sources or communication devices. As a rule, the supplied audio cable has ends with connectors for a mini-Jack socket (3.5 mm), however, there are other options for its implementation - it is advisable to clarify these points separately.
