This means the device could be powered by the body’s natural energy source, eliminating the need for batteries or external power sources. This technology could revolutionize healthcare, particularly for remote areas and developing countries where access to healthcare is limited. The researchers have developed a flexible, wearable device that can be easily applied to the skin. This device is made of a thin, transparent film that is coated with a special chemical compound. This compound is capable of detecting the chemical composition of sweat, which is then used to analyze the data. The device is designed to be comfortable and unobtrusive, allowing for continuous monitoring of health parameters.

**1. Biofuel Cells:**
* **What they are:** Biofuel cells are electrochemical devices that use biological materials to generate electricity. * **How they work:** They operate by converting chemical energy from biological sources, such as sweat, into electrical energy. This is achieved through a process called electrocatalysis, where enzymes embedded in the cell catalyze the transfer of electrons.