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Po, that pen is on the back, you need to pull it up. The first time you pull it up, it may be tight. If it cannot be pulled up, use a piece of paper or rub it to continue pulling it up. This requires charging for half an hour, then long press the power button, the clear button, and there is also a switch at the bottom. If it is not used for a period of time, it will automatically save power and shut down