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She began with the basics. The manual instructed her to charge the scanner fully before first use. The YHD-5100’s LED glowed a steady amber as it drank power from the cradle, and Mei, alone in the shop, felt oddly companioned by that small light. The guide’s first section—Getting Started—walked her through the controls: a circular power button beneath the handle, a small mode switch to toggle between keyboard emulation and serial output, and a tactile trigger that fit naturally under her index finger. nadamoo barcode scanner yhd-5100 manual