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a) Optical image of the PENG under finger pressing. b) Output voltage generated from the PENG by finger pressing‐releasing process. c) A commercial electric watch and 15 LEDs driven by the PENG. The optical images and output voltages generated by human motions of d) wrist flexing, e) finger taping, and foot stepping by f) heel and g) toe. Reproduced with permission.[ 433 ] Copyright 2018, Elsevier Ltd.
