Sleep Tracking, Bluetooth Signals, and EMF: What Every Wearable User Should Know

Sleep tracking wearables like the Oura Ring and Apple Watch use Bluetooth Low Energy (BLE), which transmits at 1–10 milliwatts — far below the power of a phone call and well within FCC and ICNIRP SAR safety limits. WHO-commissioned systematic reviews published in 2024–2025 found no causal link between RF-EMF exposure below safety thresholds and sleep disruption. A common mistake is citing ELF (50–60 Hz power line) melatonin studies to argue against 2.4 GHz Bluetooth devices — these are different parts of the spectrum with different biological interaction mechanisms. For those still concerned, enabling airplane or low-power mode at night reduces wireless transmissions while preserving most sensor-based tracking. The more significant risk from sleep trackers may actually be 'orthosomnia' — anxiety driven by obsessing over inaccurate sleep stage estimates that wearables infer from movement and heart rate rather than measure directly.

Nguồn: https://www.freecodecamp.org/news/sleep-tracking-bluetooth-signals-and-emf-in-wearables. 8sync News chỉ tóm tắt và dẫn link; bản quyền nội dung thuộc tác giả và nguồn gốc.

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Quectel FCM365X dual-band WiFi 6, BLE 5.4, 802.15.4 IoT module features NXP RW612 MCU, optional PSRAM

Quectel has officially launched the FCM365X, a compact 25.5×18mm IoT module built on the NXP RW612 wireless MCU. It supports dual-band Wi-Fi 6, Bluetooth 5.4 LE, and 802.15.4 (Zigbee, Thread, Matter over Thread), with 8MB SPI flash and optional PSRAM — making it the only RW612-based module currently offering on-module PSRAM. The module exposes a wide range of interfaces (GPIO, UART, USB, I2C, I2S, ADC, LCD, PWM) via LCC+LGA packaging and operates from -40°C to +85°C. Development is SDK-based via QuecOpen; AT command firmware is not available. Two development boards are planned but details and pricing are not yet published.

#iot#bluetooth