"Band-powered" refers to a type of technology or device that utilizes a band, often made of elastic or other materials, to generate energy or perform a function. This concept is commonly seen in fitness trackers and smartwatches, where the band may include sensors that monitor physical activity or heart rate. In some cases, band-powered devices can also refer to systems that harness kinetic energy from movement. For example, a band-powered flashlight might use the motion of a user’s arm to generate light, eliminating the need for batteries and promoting sustainability.