求翻译：4.充电：当元气兔的灯光亮度经调节也不能使您正常照明，表明产品本身可充电电池的电量不多了，您得为元气兔充电了。具体充电操作请参考使用说明书第一条。是什么意思？

4. charging: when money rabbit lighting brightness adjustment cannot make you normal lighting, indicates that the product of their own rechargeable battery power is running out, you have to charge the money rabbit. Specific charging operations please refer to the manual first.