​Classical Appearance with helpful function Expert Design and Quality for Residence and Workplace High Safety Functioning voltage: DC 12V RFID Card Ability:500 cards, a "Personal PIN" goes alone with each card Lock relay time:3 secs Card checked out distance:5 -15 cm RF card kind: EM or EM suitable card Working temperature level: -10 ~ 70 C. Door Bell Choice. Door Open options (admin user selectable): Card (Key Tag) & Password/ Card (Trick Tag) Just/ Password Just. Dimension: 11.8 cm * 11.8 centimeters * 2.3 cm( approx).