This is the DS1307 Real Time Clock
The module comes fully assembled
The DS1307 is accessed via the I2C protocol.
Two wire I2C interface.
Hour: Minutes: Seconds AM/PM.
Day Month, Date – Year.
DS1307 based RTC without LIR2032 battery
1Hz output pin.
56 Bytes of Non-volatile memory available to the user.
Size:2.9cm x 2.6cm – 1.14inch x 1.02inch.

Package included：

1 x Arduino AVR ARM PIC 51 New RTC I2C DS1307 AT24C32 Real Time Clock Module

This module is without battery(battery type is LIR2032) because we received the notice from the post office that they don’t accept goods with batteries.