Item Type: Breakout Board <br>Color: Blue<br>1、This is an excellent battery-powered real-time clock, even if reprogramming or power failure, your microcontroller project can track the time <br>2、This module is very suitable for data storage, clock construction, time stamps, timers and alarms, etc. <br>3、Equipped with PCF8523 RTC, it can work under 3.3V or 5V power supply and logic voltage <br>4、Works well when used for Raspberry Pi (or similar single?board for linux computer) <br>5、The real-time clock module is small and compact, suitable for installation in various projects, and does not take up space1. CR1220 battery is not included with this product. We recommend that you purchase a coin cell battery to use with this product. <br>2. PCF8523 is not a high?accuracy device, it may be lost or increased by up to 2 seconds in a day. For high?accuracy, temperature?compensated alternative products, please check DS3231 accuracy RTC. <br>3. If you need DS1307 for compatibility reasons, please check our DS1307 RTC group discussion.1 x Module<p>1 x Pin</p>