| Display | 2.4-inch TFT LCD Color Screen |
| Fingerprint Capacity | 3,000 |
| Card Capacity | 5000(Optional) ID or mifare card |
| Transaction Capacity | 100,000 |
| Sensor | SilkIDÂ Sensor |
| Algorithm Version | ZKFinger VX10.0 |
| Communication | RS232/485, TCP/IP, USB-host |
| Access Control Interface | 3rd Party Electric Lock, Door Sensor, Exit Button, Alarm, Doorbell |
| Wiegand Signal | Input, Output,SRB |
| Aux. Input | 1ea for linkage function |
| Functions | DST,Automatic Status Switch, Anti-passback,Scheduled-Bell,Printer & Wireless door bell (Optional) |
| Power Supply | 12V DC,3A |
| Operating Temperature | 0 °C- 45 °C |
| Operating Humidity | 20%-80% |
| SDK and software | Standalone SDK,ZKBioAccess |
ZKTeco F21
F21 is the first time attendance and access control terminal applying the most advanced SilkID technology. It not only possesses outstandingly high identification rate towards dry, wet and rough finger, but also provides the utmost security by its live finger detecting capability.as well as photo taking function which enables attendance photo and Photo ID(optional).
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