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. 2021 Mar 17;7:25. doi: 10.1038/s41378-021-00248-z

Fig. 5. Portable and wearable self-powered systems as human–machine interaction interfaces.

Fig. 5

a Multifunctional electronic skin as a smart anti-counterfeiting signature system (SASS). Reprinted from ref. 97 with permission. b Triboelectric touch-free screen sensor (TSS). Reprinted from ref. 98 with permission. c Glove-based multifunctional human–machine interface based on TENG. Reprinted from ref. 99 with permission. d Self-powered triboelectric flex sensor (STFS) for sign language interpretation. Reprinted from ref. 100 with permission.