They're used to demonstrate to potential new hires how an e-ink screen can hold an image indefinitely without being connected to a power supply.

他们是被用来向未来的新职员展示电子墨水的显示屏是如何在没有电力支撑的情况下无限期地显示图像的。

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Maintenance department: maintenance industries circuit boards, machine equipment system, main board, controller, power supply, frequency converter, PLC and touch screen.

维修部：维修各行业电路板，机加工设备系统，主板，控制器，电源，变频器，PLC触摸屏等。

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The company's new products including the special vehicle LED screen power supply series, rainproof circular transformer and security monitor power supply series enjoy strong market advantages.

研发的车载led显示屏专用电源系列、防雨环形变压器，安防监控电源等新产品，有很强的市场优势。

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