The Real-time clock & microSD breakout keeps accurate time and supports external memory through a microSD. The breakout features the DS1307 Real-time clock with battery holder for reliable time readings in case of breakout power outage. The RTC/SD Breakout also features a microSD card slot, adding external memory to read/write pictures, text files, audio and much more. Add accurate time measurement and external memory to your next Arduino project! 100% Arduino Compatible Operating voltage: 3.3V – 5V MAX counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap year compensation valid up to 2100 microSD card support 5v to 3.3v regulator for SD card operation. microSD SPI interface DS1307 RTC I²C interface CR1220 battery required (not included)

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