The first thing to see is whether the purchase is a rechargeable keyboard? Some keyboards can only use batteries, if the battery is purchased, it can only be plugged into the battery. Can you view it clearly when buying? It is best to buy batteries and charge 2 for use.
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If it is a keyboard that can be charged, you can check whether there is a usb interface on the left and right sides of the keyboard, there is no charging, and some can be charged directly into the phone line.
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Generally, it is displayed in green during the recharge process, and it is red after the recharge is completed. The recharge time is 2-3 hours, and it is OK to use normally after the recharge is completed.