Real time clock module

Model: DS1307.
Real time clock module.
Specifications:
Operating voltage: 5 V DC.
Operating temperature: -55°C to +125°C.
Accuracy: ±2ppm at 25°C.
Clock operating frequency: 32.768KHz.
I2C interface: standard I2C interface, with 7-bit addressing.
SRAM memory: 56 bytes of battery-backed SRAM.
Battery backup: 3V lithium coin cell or equivalent.
Operating current: 55uA (at 3V battery).
RTC operating current: Max. 200uA.
I2C communication speed: 100KHz and 400KHz.
Real-time clock counter: hours, minutes, seconds, day, date, month and year.
Size: 27 mm * 28 mm * 8.4 mm.