ITEM NAME:5PCS I2C Tiny RTC DS1307 Real Time Clock Module AT24C32 Board for Arduino T F6U2 5PCS I2C Tiny RTC DS1307 Real Time Clock Module AT24C32 Board for Arduino T F6U2 Two wire I2C interface Hour : Minutes : Seconds AM/PM Day Month, Date - Year Size: 28x25x10mm Leap year compensation Accurate calendar up to year 2100 1Hz output pin 56 Bytes of Non-volatile memory available to user Color: picture color Material: PC+ metal Package Contents: 5* clock modules 5* button batteries 60* pin headers