Core Chip: Features the DS1307 RTC IC – a low-power, full binary-coded decimal (BCD) clock/calendar.

Operating Voltage: 3.3V to 5V DC – compatible with Arduino, Raspberry Pi, ESP32, and other microcontrollers.

Timekeeping: Tracks seconds, minutes, hours, day, date, month, and year with leap year adjustment (valid up to 2100).

Battery Backup: Includes a CR2032 coin cell battery holder to keep time running during power loss.

Communication Interface: Uses I2C (Inter-Integrated Circuit) protocol with 7-bit address 0x68 for easy connection.

Clock Accuracy: Standard quartz crystal oscillator – less precise than DS3231, but sufficient for many projects.

Additional Features:

Square-wave output pin for timing signals.

Simple and easy-to-use with Arduino RTC libraries.

Compact Module: Small PCB with onboard crystal and battery holder.