| Brand | ZKTeco |
| Model | SF420 |
| Hardware CPU | Linux OS |
| Sensor | Zk Optical Sensor |
| Sensor resolution | 500DPI |
| Activation sensor | Infrared auto-activation |
| Algorithm | ZK Finger 10.0 |
| Read time | < 1 Sec. |
| Capacity | Up to 1.500 fingerprints |
| Records | 80.000 registers |
| Identification modes | Fingerprint, Card, Pin and combinations |
| Screen | 2.8" Colour TFT resistive touchscreen |
| Communication | TCP/IP, RS485 & USB |
| Outputs | Wiegand OUT, Relay, Anti-tamper, Doorbell |
| Inputs | Wiegand IN, Door sensor, Push to exit |
| Software | ZK Access 3.5 / ZK Time Net 3.0 / ZK Time Net 3.0 Lite |
| Power supply | DC 12 V / 3A max. |
| Degree of protection | Valid for interior |
| Temp. operation | -10º C ~ +45º C |
| Dimensions | 105(W) x 105(H) x 32(Fo)mm |
| Weight | 600 g |