声明：本说明书著作权归青岛欣易云联电子科技有限公司所有，未经允许任何单位或个人不得用于商业用途。
Details of interface and key functions
USB tester system
Short press the " ON/OFF " button to turn on and off the USB output, long press the "
ON/OFF " button for 2 seconds, the screen can rotate, 360 ° four-way rotation.
Short press the " UP/DOWN " key to turn pages with one key。
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