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Product features: 1 Self-developed simplified Chinese character library, no garble 2 Shell material using imported North American pepper, punk screw accessories, wood and metal collision, erase high-quality industrial style 3 screen using TFT custom 4 self-designed main control board, refused to apply the open source motherboard 5 built-in CH340 download chip, Firmware update support 6 Support third party open source firmware (using third party firmware, not teaching) 7 Stock monitoring CPU RAM VOL 9 timer support for positive timing and countdown