PICO RTC DS3231 - Technical Details; Specifications

Optional format: 24-hour OR 12-hour with an AM/PM indicator.
2 x programable alarm clock.
Provide online documentation (Raspberry Pi Pico C/C++ and MicroPython example
demos).
Specification
Operating voltage: 3.3V
Backup battery voltage: 2.3V~5.5V
Operating temperature: -40°C ~ 85°C