Main technical parameters Communication protocol: ISO14443A protocol, EM4100 series Support card: MF 1k/4k/UTL/Dfire Read distance: >3cm Interface: Wiegand, TTL, UART, USB, can be customized Voltage: DC 5V Current: <50mA Working temperature: -20°C~+70°C Reading tips: buzzer tips, LED instructions Module size: 33×17×4mm (external buzzer)