1. real-time communication 2. 4,000 cards, 24,000 records 3. USB memory/RS232/RS485 for connection 4. reading istance >3 cm Dimension: 175mm×130mm×45mmWeight: 600gPower Supply: DC9V~12V,500mACurrent: 190mATemperature & Humidity: -20°C~60°C, 0%~95%Identification: EM card (ID card)Response Distance: > 3 cmCommunication Protocol: USB memory, RS232, RS485Capacity: 4,000 cards, 24,000 records Reader, ...