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Zk teco built in backup battery fingerprint time attendance device selling points ZKteco K40 is an. This professional RFID access control system, biometric time attendance terminal, and smart door lock provides secure, efficient, and auditable entry management for offices, factories, schools, hospitals, and gated residential communities. The ZKTeco K40 and S30 biometric fingerprint time attendance terminals store up to 3,000 fingerprint templates with real-time network connectivity — providing tamper-proof attendance records that eliminate manual time-sheet fraud. The Hikvision DS-K1A802AMF fingerprint time attendance device with OLED display supports multi-factor verification including fingerprint, RFID card, and PIN for high-security access control. The RFID proximity card system uses 13.56MHz Mifare or 125kHz EM technology for contactless identification of authorised users. The ANVIZ VF30 Pro standalone access control reader supports fingerprint, card, and PIN in a single compact, weatherproof unit for door entry control. The smart RFID door lock provides keyless, code-based entry for residential and commercial doors.