1. 具有密码输入，密码清除，能上锁，开锁，还有密码修改的功能。 2. 密码输入三次错误能自锁，报警的功能。要求上锁，开锁，报警都用发光二极管显示。 3. 输入的数据能够在数码管上显示。 -1. With a password, password clear, can lock, unlock, as well as the password change function. 2. Wrong password three times to self-locking and alar