可设定从1位到8位的密码，从键盘键入正确密码才可更改密码或开锁。输入三次错误密码电路就不断报警。开锁信号输出口用发光二极管表示。-Can be set from 1-8 password, type the correct password from the keyboard in order to change the password or unlock. Enter the wrong password three times the alarm circuit will continue