What type of baby monitor do you need?

Nearly all baby monitors operate on a frequency of 49 MHz, 900 MHz or 2.4 GHz. Many other electronics also use these bandwidths and they can all interfere with each other. Digital monitors improve over analog models by scrambling the signal, but they still are subject to interference from cordless phones, wireless networks and even microwave ovens, which use a 2.4 GHz frequency to heat food. Several years ago, the Federal Communications Commission 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. However, although DECT technology is superior to analog technologies, the majority of baby monitors are still analog. Some analog monitors are very inexpensive and may be just fine if you don't live in a apartment building or other high-density area -- or if you don't have a lot of other electronics that could result in interference.

Experts often recommend that, depending on needs, buyers look for monitors with multiple receivers, sound-activated lights, low-battery indicators and rechargeable batteries. Here are some other things experts say shoppers should consider before buying a baby monitor:

  • Look for a digital DECT baby monitor first. Digital monitors that work on the 1.9 GHz DECT frequency are the best assurance against accidental eavesdropping or signal interference.
  • Compare the monitor's frequency to that of your 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 reduce the likelihood of signal 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 useful because televisions and vacuums can sometimes drown out the sound of the baby monitor, but light-sleepers beware: these often trend toward being very bright. Look for models with a light on/off option.
  • 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. Additionally, most baby monitors possess an out-of-range indicator and volume controls. Most also have more than one channel, so users can switch channels to find better reception.

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