温馨提示：如果密码为4位或5位，可在输入4位或5位密码后直接按确认键即可，无须在前面或后面加零补足6位。
Tips: for 4 or 5 digit password, you can press the button of "enter" after entering 4 or 5 digit password. It is not needed to enter zero before or after password to make up of 6 digits.
十位数为0的时候，显示为空白。 用两个按键控制数值的加减，按一次K1数字加1，按一次K2数字减1，数值的范围是从0到99。
Control values with addition and subtraction of two keys, K1 by a number plus 1, K2 by a number minus 1, the values range from 0 to 99.
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