Main technical parameters Communication protocol: ISO14443A協議, EM4100 series Support card: MF 1k/4k/UTL/Dfire Read distance: >3cm接口: 韋根, TTL, UART, USB, can be customized Voltage: DC 5V Current: <50mA Working temperature: -20°C~+70°C Reading tips: 蜂鳴器提示, LED instructions Module size: 33×17×4毫米 (外部蜂鳴器)