Clarity HA-40 40dB In-line Handset Amplifier

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The HA40 telephone amplifier by Clarity amplifies incoming phone call volumes up to 100 times the normal volume (+40 dB) for people with hearing loss to hear their callers better on the telephone.

This HA40 Clarity brand in-line telephone amplifier is a battery-powered phone amplifier with slide controls for both volume and tone, providing up to 40 decibels of amplification for telephone users with hearing loss. The tone selector amplifies specific frequencies for optimum speech clarity and distinction between similar sounding words, allowing users with a hearing loss to customize the assistive listening device.

The HA40 telephone amplifier has a special boost button to maximize amplification while blocking out feedback and background noise. The HA40 is compatible with most home and office telephones and is easily connected between handset and phone base. The HA40 uses a 9V battery (included), and is a great secondary or backup amplifier for amplifying a telephone at home, work or travel.


  • Clarity® Power™ technology
  • Tone control
  • Boost button maximizes amplification while reducing background noise
  • Compatible with most corded home and office phones
  • Will not work with Trimline telephones or phones with a dial pad in the handset
  • Uses 9V battery (included)

Please note: In-line telephone amplifiers will not work with Trimline telephones or telephones with a dial pad in the handset.

3 Reviews Hide Reviews Show Reviews

  • 5
    Great product

    Posted by Jeremy on 15th Jun 2020

    We purchased this for a salesman and since installation he is able to hear so much better. Super easy to install and I love the power off function when not in use to keep from draining the battery.

  • 5
    Great product

    Posted by robert Cusolito on 27th Mar 2017

    I just recieved myAmeriphone HA-40 40dB In-line Handset Amplifier and am very please with the phone and the price I paid for it.

  • 5
    Ameriphone HA-40 40dB In-line Handset Amplifier

    Posted by Unknown on 27th Mar 2017

    A very good product at a great price and easy to use.