Applications of ZMSDs. (A) Photographs of the ear-shaped conformal ZMBs (left) that were seamlessly unitized with a human ear after being coated with a skin-safe silicone elastomer (right). (B) Photograph of the ear-shaped conformal ZMBs connected to a hearing aid equipped with an LED. Insets show the successful operation of the hearing aid by the conformal ZMBs, which were verified by the activated LED (left) and amplified sound (right). (C) Charge/discharge profiles of the ear-shaped conformal ZMBs (consisting of two unit cells connected in series) [71]. (D) Open-circuit voltage demonstration of a cloth knitted with three ZMBs (15 cm in length) in series, photographs of an LED watch, LED screen, and iPhone 4s powered by the ZMBs [127]. Reproduced with permission.