All electronics ship with US style plugs.You may need a voltage converter or a plug adapter.
Special Features
This real-time clock breakout board (RTC) with battery backup allows your microcontroller project to track time even in the event of reprogramming or power loss
DS1307 is the most popular RTC at present, and its operating voltage is 5V
It's perfect for data logging, clock building, time stamps, timers, alarms, etc