Two wire I2C interface. 
Hour : Minutes : Seconds AM/PM. 
Day Month, Date - Year. 
DS1307 based RTC (Battery not included). 
1Hz output pin. 
56 Bytes of Non-volatile memory available to user. 
The DS1307 is accessed via the I2C protocol. 
The module comes fully assembled and pre-programmed with the current time.

Size: Approx. 27mm X 28mm X 8.4mm
Color: As the picture shown

Packing content: 1 piece DS1307 Time Clock Module