1.按键设置6位密码，输入密码若密码正确，则锁打开。显示open！
2.密码可以自己修改（6位密码），必须是锁打开时才能改密。为防止误操作，修改密码得输入两次。
3.若密码输入错误次数超过3次，蜂鸣器报警并且锁定键盘。
4.24C02有复位、掉电保存密码功能。
5.液晶屏亮度会随光线自动调整。(1. button set 6 bit password, enter the password, if the password is correct, then open the lock. Display open!
2., passwords can be modified (6 bit password), must be locked to open when you can change the password. In order to prevent misoperation, the password has to be entered two times.
3. if the password input error more than 3 times, the buzzer alarm and lock the keyboard.
4.24C02 has reset, power down, save password function.
5. the brightness of LCD screen will be adjusted automatically with light.)