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Whenever the AM Hidden Fence signal is "off" it's open to interference with other AM radio signals coming from a number of common household electronic devices. The result of this interference is a digital AM Hidden Fence system that's prone to "misfire", randomly shocking your pet. This can lead to a confused and frightened animal.
Alternatively, the DogWatch® FM Hidden Fence uses a "continuous" radio signal that does NOT switch on and off throughout its transmission. Since the fence signal is always "on" the FM system doesn't respond to ANY ambient radio wave interference. Therefore...
A DogWatch® digital FM Hidden Fence will NOT misfire, making it the SAFEST system for your pet. 
Digital Modulation (DM) is the radio signal processing technology used by ALL Hidden Fence products available on the market today. No matter if the product is based on AM or FM radio, DM is the technology used to process the transmissions. There is nothing special or unique about the use of DM within the Hidden Fence industry. All products available today use this technology.
The reason certain Hidden Fence companies make a big deal about offering Digital Modulation is because their products are actually AM radio based.
Since digital AM radio is inferior to digital FM, these companies are forced to use marketing hype in an attempt to compete against the ONLY Hidden Fence company in the entire industry that offers an FM radio based product; DogWatch®. By drawing attention to a commonly applied technology (DM) and making it “sound” like an advancement that differentiates their product, these companies are attempting to divert attention away from their greatest weakness; an AM radio based product.
Fortunately, an educated consumer will see right through this. DM is NOT a next generation, "advanced" radio technology being offered by specific Hidden Fence companies. Rather…
ALL Hidden Fence companies use Digital Modulation throughout their entire product line(s).
Your car radio is a good illustration of this. Installed in each (late model) automobile is a “digital” AM/FM radio. Regardless if the channel you tune to is AM or FM a “digital” (DM) radio is processing the incoming signal, providing you with something to listen to.
Also, no matter who manufactured your car (Ford, BMW, Toyota, etc), the radio is using a form of Digital Modulation to interpret the AM or FM radio signals. What makes one car radio sound better than another often comes down to simply tuning it to an FM station rather than an AM station. Similarly…
What makes one Hidden Fence product better than another is simply the type of radio modulation it uses; FM vs. AM…
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Note: Anyone interested in getting closer to the technical details of this subject can visit a number of different sites that provide more information:
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