Should you worry about the EMF from your baby monitor and cordless phone?

Cordless phones and baby monitors operate well below the exposure limits set by the FCC and ICNIRP, and the measured levels drop off quickly with distance. The part worth knowing is that some of these devices transmit around the clock even when nobody is using them, and a few free settings change that.

Most homes have a quiet layer of wireless gear that was set up once and never looked at again: the cordless phone base, the baby monitor on the dresser, the extender behind the couch. They sit in bedrooms and nurseries for years, and almost nobody knows how they behave when they look idle.

How a cordless phone actually transmits

Most modern cordless phones use a standard called DECT. In the United States, DECT 6.0 phones run in a band the FCC set aside for them, 1920 to 1930 MHz. In Europe the band sits slightly lower, around 1880 to 1900 MHz.

The Swiss Federal Office of Public Health publishes unusually clear numbers on these. Peak transmit power for both the base and the handset is 250 milliwatts. The handset sends nothing when you are not on a call. The base is the one to watch: on many models it sends a short pulse every 10 milliseconds, all day, just to stay in touch with the handsets.

Averaged over time that idle signal is small, about 2.5 milliwatts by their figures. But it is constant, and the base often lives on a nightstand or a desk.

Baby monitors are a mixed bag

Baby monitors come in several flavors. Some audio monitors use the same DECT technology as cordless phones. Many video monitors use the 2.4 GHz band, the same neighborhood as older wifi. Wifi monitors send their stream through your router and out to an app.

Germany's Federal Office for Radiation Protection, the BfS, flags one detail that most parents never hear about. On some models, the out-of-range indicator works by having the nursery unit transmit continuously. The BfS suggests checking your monitor's range yourself, choosing devices with the lowest practical field strength, and keeping the unit and its power supply as far from the crib as it can be while still working.

What the science says, plainly

The FCC sets a specific absorption rate limit of 1.6 watts per kilogram for devices held against the body in the United States. ICNIRP guidelines, which much of the world follows, cover the same frequencies. In a study for the Swiss government, cordless handsets measured between 0.01 and 0.05 watts per kilogram, far below either limit, and field strength near the base fell off sharply within the first few feet.

We will not pretend the file is closed. In 2011 the IARC classified radiofrequency fields as a Group 2B possible human carcinogen, meaning evidence worth studying rather than proof of harm, and its review specifically included cordless phone studies. The NTP 2018 studies found some evidence of tumors in rats exposed to RF at levels well above ordinary use. Neither is a verdict on the monitor on your dresser. Both are reasons agencies recommend easy precautions.

The setting almost nobody turns on

Many DECT phones sold in the last several years include an ECO mode. With it on, the Swiss health office notes, the base stops transmitting while idle and only transmits during calls. It is usually one menu item, often labeled ECO, ECO plus, or low radiation.

For bases without that option, the same office suggests keeping them at least 50 centimeters, roughly 20 inches, from places you sit or sleep for long stretches. Many baby monitors offer a voice activated or eco setting that transmits only when there is sound. Distance, time, source strength. The three principles apply here exactly as they do everywhere else.

The safety rule that is not about EMF at all

While you are moving the monitor, check the cord. The US Consumer Product Safety Commission recommends keeping every monitor cord at least 3 feet from any part of the crib, bassinet, or play yard, and never placing a monitor on the crib edge. That guidance is about strangulation, not radiation, and it is the most important sentence in this issue.

What a sticker can and cannot do here

BioHarmonize stickers are made for phones and personal devices. A sticker does not turn on ECO mode, change what a baby monitor transmits, or move a base station across the room, and we are not going to imply otherwise. The changes below are free, and they are the substance of this one.

What to do this week

Walk through the house and find every cordless base and monitor unit. Open the phone menu and look for ECO mode. Check the monitor for a voice activated setting and test its range from the room where you actually listen.

Then move anything that sits by a bed or crib a few feet back, keep every cord 3 feet from the crib, and let the phone that doubles as a white noise machine sit across the room in airplane mode.

Optimize your environment. Unlock your potential.

Yarden and Jessica