A new smart pendant uses UV sensor technology to alert users when they've had too much sun exposure, helping prevent sunburn.

Smartphones and smartwatches are cool, but can they measure your sun exposure?
Assessing Your Sun Exposure: Can Smart Devices Be Trusted?"
Smartphones and smartwatches are increasingly popular tools, but their capabilities go beyond just staying connected. Many of these devices now include features such as UV sensors that can estimate sun exposure. These sensors use various methods, including measuring the amount of UV radiation that enters the device, to calculate the amount of time a user has spent in the sun.
Users can input their location and activity, and the device will provide an estimate of the UV index. This information is then used to calculate the cumulative exposure, which is a measure of the total amount of UV radiation a person has been exposed to. However, there are some limitations to these features.
One issue is accuracy. Studies have shown that there can be significant discrepancies between estimated and actual sun exposure. This may be due to various factors, including the device's sensitivity to UV radiation and the complexity of the sensor technology. Furthermore, users may not always enter the correct data, which can also affect the accuracy of the results.
Despite these limitations, these features have the potential to be an effective tool for individuals who wish to monitor their sun exposure and take steps to protect themselves from skin damage. By understanding how accurate these devices are, users can make more informed decisions about their time in the sun.