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The optical image (a) and the output voltages (b) generated by finger pressing-releasing process. A commercial electric watch and 15 LEDs driven by the converted electric energy from finger pressing-releasing process (c). The optical image and output voltages generated by human motions of (d) wrist bending, (e) finger taping and foot stepping by (f) heel and (g) toe. Reprinted with permission from [107].
