Conclusion
UVR-exposure
We found no evidence that a UVR-exposure measurement intervention resulted in differences in sun protective or exposure behaviors, which may have been due, in part, to unexpected problems with the device. Based on our experience, and before further research is conducted with UVR-measuring devices similar to the one we used, the technology needs considerable improvement—for example, by integrating it into reliable devices people already use and by waterproofing the device. Additional changes to the mobile app messages are needed to promote more comprehensive sun protection behaviors, primarily sun avoidance and clothing [