# Wireless baby monitor

> A 2.4 GHz video monitor placed a metre from a cot is a continuously transmitting source at close range — roughly 8,000 µW/m² at 1 m for a 100 mW unit.

- Canonical URL: https://emfbase.com/emitters/baby-monitor
- Collection: Sources & emitters
- Record id: `emitters:baby-monitor`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/emitters/baby-monitor
- Also known as: nursery camera, video monitor

## Key values

- **Category:** radiofrequency
- **Emission bands:** 2.4 GHz ISM; DECT / FHSS audio
- **Environments:** home
- **Transmit power:** 0.1 W EIRP — Regulatory value — legally enforceable — Typical Part 15 consumer transmitter power. Transmit power is the regulatory or typical maximum; real devices often transmit below it and reduce power when link quality allows. [fcc-part15]
- **Duty cycle:** Video monitors stream continuously; audio-only and voice-activated units transmit intermittently.

## Field strength by distance

- **30 cm:** 88,400 µW/m² — Computed estimate — S = EIRP / (4πd²) with EIRP = 0.1 W, d = 0.3 m [fcc-part15]
- **1 m:** 7,960 µW/m² — Computed estimate — S = EIRP / (4πd²) with EIRP = 0.1 W, d = 1 m [fcc-part15]
- **3 m:** 884 µW/m² — Computed estimate — S = EIRP / (4πd²) with EIRP = 0.1 W, d = 3 m [fcc-part15]

## Mitigations, most effective first

- **Place the unit at least 2–3 m from the cot rather than on the cot rail.** — Increasing 0.3 m to 3 m is a 100× reduction in power density.
- **Choose an audio-only, voice-activated, or wired monitor.** — Removes continuous transmission during sleep.

## Measure with

- Broadband RF power-density meter

## Related records

- [Building Biology SBM-2024 RF band: extreme anomaly](https://emfbase.com/limits/building-biology-rf-extreme-anomaly): Above 1000 µW/m² peak from a single RF source in a sleeping area is graded 'extreme anomaly' and triggers a remediation recommendation.
- [Wi-Fi router (2.4 / 5 / 6 GHz)](https://emfbase.com/emitters/wifi-router): A consumer access point radiating roughly 100 mW EIRP per band, giving about 8,000 µW/m² at 1 m and 80 µW/m² at 10 m in free space.

## Sources

- `fcc-part15` U.S. Government Publishing Office (eCFR). *47 CFR Part 15 — Radio Frequency Devices (unlicensed transmitter power limits)*. https://www.ecfr.gov/current/title-47/part-15 — regulation, link checked 2026-08-12
- `itu-fs-relations` International Telecommunication Union. *Free-space path loss and power density relations (ITU-R P.525)*. https://www.itu.int/rec/R-REC-P.525/en — standard, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.