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M5Stack Unit CardKB2 Keyboard Input Device is a card-sized 42-key portable keyboard input unit and equipped with ESP32-C61HF4 System-on-Chip (SoC). This device supports 2.4GHz Wi-Fi 6/BLE wireless communication and reserved M2 mounting holes for easy integration into applications. The unit CardKB2 features an onboard HY2.0-4P connector that enables communication in I2C/UART mode, while a USB Type-C® port provides power supply and firmware flashing. This compact and lightweight device is ideal for everyday carry and embedded integration. Additional features include an RGB LED status indicator, a reset button, a boot button, and built-in input overvoltage protection. Typical applications include text input for portable devices, HMI in embedded systems, wireless control terminals for IoT devices, and educational programming and maker projects.
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M5Stack Unit CardKB2 Keyboard Input DeviceCard-sized 42-key portable keyboard input unit and equipped with ESP32-C61HF4 SoC.2026-04-21
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