This is a 3PCS pack of XIAO MG24, which is based on Silicon Labs' EFR32MG24 SoC, featuring a high-performance 78MHz ARM Cortex-M33 core. This development board is Matter native over Thread and Bluetooth Low Energy 5.3, all supported by the Arduino Core. With 4MB Flash onboard, 19 GPIOs, LED, and charging circuit, it boasts extremely low operating current and ultra-low-power modes, making it an ideal choice for IoT applications, especially battery-powered projects utilizing Matter protocols.