To address the problem of frequent battery replacement for wearable sensors applied to fall detection among the elderly. a portable and low-cost triboelectric nanogenerator (TENG)-based self-powered sensor for human gait monitoring is proposed. The main fabrication materials of the TENG are polytetrafluoroethylene (PTFE) film. aluminum (Al) foil. https://herbsdailyes.shop/product-category/slippery-elm/