6位开关密码锁（两位为虚位），密码正确解锁，并且在输入第一个密码后，5秒必须输完密码，否则不能解锁；密码错误，响铃20秒，并且锁死 -6 switch lock (two empty spaces), the password is correct unlock and enter a password after five seconds must losers password, or can not unlock wrong password, ringing 20 seconds, a