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1-800-301-3137
Send us your hearing test
FAX 1-877-433-3040
Use Coupon Code 08CCFDD when you purchase your new hearing aids to receive a FREE box of 40 hearing aid batteries! (Limited time offer)

Doorknock 400

Discontinued

The new and improved Doorknock signaler can now be used as a security device! When someone touches the door knob, the signaler will flash! It can be used in one-room apartments, dorms, offices, hotels... anywhere. Its size makes it great for travel. The light flashes when someone knocks at the door. Use it as a flashlight too.

  • Door chime or door alarm (105 dB)
  • Flashlight with ultra bright LED
  • Double sensor: vibration sensor when hanging over the top of the door (bracket included), and electrostatic sensor when hanging on the door knob.
  • HIGH/LOW sensitivity selector
  • ALARM/OFF/CHIME switch
  • FLASHLIGHT ON/OFF switch
  • Battery low indicator
  • Operates with 3 AA batteries (not included)
  • 6V DC power jack (AC adapter sold separately)

We're here to help you!

Contact Precise Hearing

Precise Hearing's trained specialists are happy to assist you in choosing the right hearing aid solution for your unique loss. They can also:

  • Help determine how to read your hearing test
  • Help you find the tubes, domes, and other accessories that fit your current hearing aids
  • Offer support for hearing aids and/or accessories that you have already purchased through Precise Hearing

Call Us

Sales: 1-800-301-3137
Support: 1-877-704-4424
Fax: 1-877-433-3040

E-mail Us

info [at] precisehearing [dot] com

Our Hours of Operation

Our business hours are Monday - Friday:

Eastern: 11:00am to 7:00pm

Central: 10:00am to 6:00pm

Mountain: 9:00am to 5:00pm

Pacific: 8:00am to 4:00pm

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