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AJMRTC precision RTC module is built with DS3231 chip for Raspberry Pi Pico. It delivers highly accurate real-time clock function. With backup battery support, the module continues counting time and preserves timestamp data after main power loss. It uses I2C interface for simple integration with Raspberry Pi Pico and other MCUs. Low power consumption makes it perfect for long-running unattended embedded systems. Raspberry Pi Pico and backup battery are NOT included.