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This product is discontinued, please consider the Raspberry Pi RTC Expansion Module v1.1 as an alternative.
This is a Super Capacitor Real-Time Clock module, it design for Raspberry Pi, but it also can be used to Arduino.
Pluging it into Raspberry Pi GPIO interface, and all is ok. This is the easiest way to keep it in time.
Compared with the Mini RTC Module，it not include battery. Because it has super capacitor.
Work in 3.3V and 5V
Supported Raspberry Pi and Arduino
Compatible with Raspberry Pi A+,B,B+/2.
DS3231 RTC IC
Self-adjust 3.3V and 5V
Size: 14x16x12 mm