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Product characteristic: electronic cylinder Additional feature include: - Keys are electronically programmed to open only specific locks during a designated schedule. Schedules may also contain an expiration point to completely disable the key until it is audited and reprogrammed. - Audit information recorded in both the lock and key shows a time-and-date stamped record of every event, including authorized accesses and unauthorized attempts. - Medeco XT key provides all power to the cylinder, eliminating the need for any hard wiring or power supply. - Medeco XT products add a wide variety of intelligent features without compromising on physical security. - Attack-resistant design and tamper-proof features provide strong protection against forced entry. - Installation instructions are included, along with two small screws. Otherwise, no accessory materials are required for installation or use.