This is a Super capacitor real-time clock module designed for Raspberry superior, but it can also be used to Arduino. Plug it into Raspberry superior gpio interface. This is the easiest way to keep it in time. Compared with the previous 277258 mini RTC module, it doesn't include a battery because it has Super capacitor. Work in 3.3V and 5V. Supported Raspberry superior and Arduino. Compatible with Raspberry superior a+, b, b+/2.