Nearly all baby monitors operate on a frequency of 49 MHz, 900 MHz or 2.4 GHz. Many other electronics are also using these bandwidths and they can all interfere with each other. Digital monitors improve over analog models by scrambling the signal, but they still operate on the same frequencies and are subject to interference from cordless phones, wireless networks, cordless game controllers and even microwave ovens, which use a 2.4 GHz frequency to heat food.

Several years ago, the FCC approved a new frequency for voice-only communications -- 1.9 GHz -- also called DECT (digitally enhanced cordless telecommunications). Some cordless phones and a handful of baby monitors now use DECT technology. Because this frequency isn't used by lots of other electronics, there's less chance of interference.

Reviews say you should consider the following when shopping for a baby monitor:

  • Consider a digital DECT baby monitor first. Digital monitors that work on the 1.9 GHz DECT frequency are the best assurance against accidental eavesdropping.
  • Check frequency. Remember to check the frequency of the baby monitor against that of other household items, such as your cordless phone. If you have a 2.4 GHz cordless phone or wireless network, getting a 49 MHz or 900 MHz baby monitor could hedge your bets against interference.
  • One or two receivers? An extra parent unit is useful, especially for two story houses. One unit can remain downstairs and the other upstairs. Some baby monitors allow you to add a second receiver later if you need it.
  • Lights are nice. Sound activated lights are nice, since televisions and vacuums can sometimes drown out the sound of the baby monitor.
  • Look for a baby monitor that uses rechargeable batteries. A rechargeable battery will save you a few bucks, but if the unit doesn't come with rechargeable batteries, you can always buy a set of NiMH rechargeables. You can also skip the batteries and use an electrical outlet.
  • Keep the receipt. Even the highest rated baby monitors don't work for everyone. It's not uncommon to meet parents who tried four or five monitors before they found one that could co-exist with their other electronics.

Most baby monitors have an out-of-range indicator and volume controls. Most also have more than one channel, so you can switch channels to find better reception.

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