Smartphone Flashlight Use: Most users use their phone's flashlight for lighting, taking photos, and videos, but it can also perform many other functions, including measuring your heart rate.

After seeing some heart rate monitor apps for Android which use the camera and flashlight features of the phones, [Tyson] took on the challenge of coding this for himself. But he’s not using a smart ...

When you buy through our links, Business Insider may earn an affiliate commission. Learn more Finding the best flashlight shouldn't feel like searching in the dark. Whether preparing for emergencies, ...