Photo of HA-40 In-line Amplifier

In-line Amplifier HA-40


by Clarity

  • Compatible with home and most business phones (does not attach to Princess, Trimline, or cordless phones)
  • Volume adjustable up to 30 dB
  • Separate tone control improves the clarity of the incoming voice
  • Pushing the Boost button reduces background noise and provides an additional 10 decibels of amplification
  • Runs on 9 volt battery (included)
  • One year warranty
  • For more information, click here to read the User Manual (PDF format)

      • Set-Up Tip:

      • If the phone has a volume control, make sure it is turned all the way down or off
      Troubleshooting Tips:
      • A constant squealing sound is a sign that the HA-40 is not compatible with the phone. Make sure any volume control on the phone is turned down. If the squealing continues, return the HA-40.
      • If other people can't hear the outgoing voice, this is a sign that the HA-40 is not compatible with the phone. Return the HA-40.
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Price: $34.95
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