Equipped with PCF8523 RTC Will keep time for 5 years or more Perfect for data-logging, clock-building, time-stamping, timers and alarms, etc Fully assembled & tested PCB plugs directly into your Pi's GPIO pins - No soldering required! Works with any Raspberry Pi (or similar single board linux computer) including the Pi 1, Pi 2, Pi 3, Pi Zero, A+, B+, Pi 4, etc.