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  2. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    For example, in the Los Angeles Police Department's radio procedures, Code 1 is not a response code, and its meaning is transferred to Code 2, the original meaning of which is transferred to the semi-official response code "Code 2-High". Additionally, some agencies use "Code 99" which means for all units to respond, typically used in bomb ...

  3. List of Bluetooth profiles - Wikipedia

    en.wikipedia.org/wiki/List_of_Bluetooth_profiles

    1.3 — all of 1.0 plus metadata and media-player state support [7] The status of the music source (playing, stopped, etc.) Metadata information on the track itself (artist, track name, etc.). 1.4 — all of 1.3 plus media browsing capabilities for multiple media players [8] Browsing and manipulation of multiple players

  4. Audiologists Say These Are the Best Over-The-Counter Hearing Aids

    www.aol.com/audiologists-best-over-counter...

    CRE-C20. These newly-released OTC hearing aids are packed with prescription-grade technology for less than $1,000. The Sony CRE-C20 are incredibly discreet within the inner ear, though the tiny ...

  5. Bluetooth - Wikipedia

    en.wikipedia.org/wiki/Bluetooth

    Maximum power output from a Bluetooth radio is 100 mW for Class 1, 2.5 mW for Class 2, and 1 mW for Class 3 devices. Even the maximum power output of Class 1 is a lower level than the lowest-powered mobile phones. [164] UMTS and W-CDMA output 250 mW, GSM1800/1900 outputs 1000 mW, and GSM850/900 outputs 2000 mW.

  6. Sensorineural hearing loss - Wikipedia

    en.wikipedia.org/wiki/Sensorineural_hearing_loss

    Therefore, assuming normal hearing exists around the dead region, it would produce an audiogram that has a dramatically steep slope between the frequency where a threshold is obtained, and the frequency where a threshold cannot be obtained due to the dead region. [15] Figure 7: Response of the basilar membrane to a pure tone.

  7. Our tech writer's pick for best budget earbuds are 50% off ...

    www.aol.com/lifestyle/our-tech-writers-pick-for...

    "Although I could hear the other person just fine, I had a hard time hearing my own voice, even with transparency mode engaged. ... Sony Wireless Headphones. $38 $60. Save $22. See at Amazon. MD ...

  8. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control or ANC.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.

  9. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones that use cables typically have either a 1 ⁄ 4 inch (6.4 mm) or 1 ⁄ 8 inch (3.2 mm) phone jack for plugging the headphones into the audio source. Some headphones are wireless, using Bluetooth connectivity to receive the audio signal by radio waves from source devices like cellphones and digital players. [ 5 ]