Researchers have designed a bracelet that harvests biomechanical energy from the wearer's wrist movements, which can then be converted into electricity and used to extend the battery lifetime of personal electronics or even fully power some of these devices.

The researchers, Zhiyi Wu and coauthors at Chongqing University of Technology and the China Academy of Engineering Physics in Sichuan, have published a paper on the energy-harvesting bracelet in a recent issue of Applied Physics Letters.

"The energy-harvesting bracelet could potentially be used to help power activity trackers, smartwatches, and even some health-monitoring applications," Wu told Phys.org.