Manufacturer page.

Respond quickly to security threats, lost or stolen keys, or personnel changes without the added cost of changing your locks and keys. 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. Additional features include: - Mechanical and Electronic technology are combined for superior security with Medeco® patented key control - Self-cleaning electronic contact point for a long lasting key and reliable connection - 20,000 cycle battery life - Available with RFID/PROX coil insert for dual use with HID compatible systems - Two Level low battery indicator - No accessory materials are included or required for installation or use.