Optimized Performance: Equipped with a 5V/16MHz Pro Micro-microcontroller and an ARM Cortex-M4F NRF52840 chip, this development board ensures maximum efficiency. It boasts 1MB of flash memory and 256KB of RAM, supported by for Arduino IDE V1.0.1 for seamless integration and programming. Advanced Power Management: This board features a 3.7V lithium battery interface with a unique software switch capable of cutting off power to conserve energy. When deactivated, the LED's standby power consumption is minimized to just 1mA, enhancing battery longevity and efficiency. Versatile Compatibility: Designed as a superior alternative to the Pro Micro, the SuperMini NRF52840 development board is fully compatible with Nice! for Nano. It maintains the same pin configuration as ProMicro, allowing it to integrate smoothly with nearly any Pro Micro-based keyboard setup. Innovative Design: The Pro Micro-with Atmega32U4 chip offers a robust development platform with a built-in USB updater and a Type-C interface. This design not only ensures compatibility with for Arduino IDE but also simplifies connections with modern computers and devices. Comprehensive Kit: Each package includes five Pro Micro-NRF52840 development boards, making it ideal for developers looking to create multiple projects or prototypes. The boards' small form factor and powerful features make them perfect for a wide range of applications. Color: As Shown Material: plastic Package Contents: 10 x Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.