DS1307 RTC Module I2C IC .Real Time clock with Battery Backup.*1-Hz Output Pin. 56 Bytes of Non-volatile Memory Available to User.PCB Quality: FR4 Glass epoxy High Quality. Utility: Research & Development, Education, Technical DIY etc.*Plugs into any Breadboard or You can use Wires. Battery Backup of Li (Lithium) Coin Battery 3 Volt*Read / write clock or RAM data transfer mode, there are two single-byte and multi-byte transfer mode transmission character set
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