| Technical Specification | |
| Display | 16 bits LCD |
| Screen | 4-inch (CRT) or 5.6-inch TFT |
| Video Input | 1Vp-p/75 ohrms |
| Data transmission rate | 2400bps |
| Password | 1-6 digits |
| Capacity | Can be mated with 331 units |
| Alarm delay time | 1-1000 Seconds |
| Alarm number | 3-4 digital |
| Monito Time | 1-1000 Seconds |
| Display | 4 digital |
| Conversation time limit | 75 seconds |
| Distance | 1.2Km (add online signal amplifier to extend) |
| Capacity | 208pcs (including door stations and extension GU) |
| Wiring | 6 shield lines |
| Input voltage | 130 to 250V AC |
| Voltage | DC 12V |
| Temperature | -10° ~ 55°C |
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