Specification: Origin: Mainland China Type: Module Condition: New Description: DS1307 is a low-power, full BCD code clock calendar real-time clock chip with 56 bytes of non volatile RAM. The address and data are transmitted through a two wire bidirectional serial bus. The chip can provide information such as seconds, minutes, and hours, and the number of days per month can be automatically adjusted. And it has a leap year compensation function. The AM/PM flag bit determines whether the clock operates in a 24-hour or 12-hour mode. The chip has a built-in power sensing circuit with power failure detection and battery switching functions. Product Introduction Using LIR2032 rechargeable lithium battery with charging circuit Solve the issue of DS1307 with backup battery not being able to read and write. After being fully charged, it can provide a DS1307 timer for 1 year. Compact design, 28 * 28 * 7mm Introduce the clock pin of DS1307 to provide a clock signal for the microcontroller. Can cascade other I2C devices. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Tiny RTC Module Without battery 1 x Tiny RTC Module with battery