Adafruit PiRTC - Precise DS3231 Real

Time Clock for Raspberry Pi

PRODUCT ID: 4282

This is the best battery-backed real time clock (RTC) you can get that allows

your Raspberry Pi project to keep track of time if the power is lost. Perfect for

data-logging, clock-building, NTP servers, time-stamping, timers and alarms,

etc. Equipped with a genuine DS3231 RTC, it works great with the Raspberry Pi

and has native kernel support.