Overview
Precision RTC Module for Raspberry Pi Pico, onboard DS3231 chip

The Pico-RTC-DS3231 is a RTC expansion module specialized for Raspberry Pi Pico. It incorporates high precision RTC chip DS3231 and uses I2C bus for communication. More external sensors are allowed to be connected thanks to the stackable design.
Standard Raspberry Pi Pico header, supports Raspberry Pi Pico series
Onboard high precision RTC chip DS3231, with backup battery holder
* Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
* Optional format : 24-hour OR 12-hour with an AM/PM indicator
* 2x programable alarm clock
Comes with development resources and manual (Raspberry Pi Pico C/C++ and MicroPython examples)

Package Contains
Pico-RTC-DS3231 x1

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I will then send attached document including User Guide for you, thank you for patience.;D