Classic Logic combines the usability of a mechanical keying system with the flexibility and accountability of electronics. It is available in nearly any cylinder format so fits existing hardware without modifications and can be installed in minutes. Both keys and cylinders can be programmed with specific user access rights and can both be audited for user entry time and date, offering enhanced loss and liability control on nearly any door, cabinet, or padlock where greater accountability is desired. It features a user-friendly key with easy to interpret LCD display and operates for years on an inexpensive coin sized battery.