ITEM NAME:Tiny I2C RTC DS1307 DS1307 24C32 Time Clock Module for Arduino E5U7 Tiny I2C RTC DS1307 DS1307 24C32 Time Clock Module for Arduino E5U7 With LIR2032 rechargeable lithium battery and charging circuit. With read and write function. Address- and data transmission via a serial cable with two lines and two directions. The chip provides information such as second, minute, hour and so on. With built-in current sensing circuit and voltage drop detection and battery switch function. Features: