SET THE TONE With The Only Truly Digital MP3 Doorbell...

The Tommyknocker is a USB, all digital doorbell. MP3 sound files may be uploaded to the Tommyknocker USB memory stick via a computer.

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Download Free "Rare Music Tracks from Stonecold"
Download Tommyknocker User Guide

Wiring Diagram 6 Wire
Wiring Diagram 7 Wire

FAQ - Two Wire doorbell systems &  Lighted Doorbell switches

The Tommyknocker Digital Doorbell

Set the tone with Eminem, Muddy Waters, Michael Jackson or your favorite artists the minute your visitors hit the doorbell button. You may even surprise yourself when the Tommyknocker Digital MP3 doorbell sounds off with your favorite song or sound effect. You’ll be instantly entertained and so will your guests, because you can change the audio files endlessly, whenever and whatever you want the Tommyknocker to play. So “Set The Tone” with the Tommyknocker Digital MP3 doorbell and never be bored with your old Ding Dong again!

Advantages of Wired vs. Wireless Digital Doorbells 

The TK has been designed to plug into either new or existing home doorbell systems to provide a solid and reliable doorbell. One of the advantages that the TK has is that it does not require any batteries, and, it doesn’t fall prey to the typical interference issues that we often experience with wireless devices.

Using a wireless system may provide for a slightly easier installation, but with a just a bit more effort, a wired TK would avoid all of the problems that a wireless system would present.  

This may include false triggering, blocked signal and low battery quirks. Wired doorbells have been around for 90 years because they were built to last the life of your home. The TK follows this tradition, built to last, reliable and hassle free.  

Customer Testimonials

Great customer support.  Thank you”.

Tim Taylor
Santa Cruz, CA   .... read more


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About Us

Predominance, LLC was formed in 2009 as a holding company for technologies developed over the years for use in both residential and commercial markets. More..

Contact Us

Phone: 973-886-7560
Predominance, LLC
Sparta, NJ 07871

E-mail: Support


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