Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi

This battery-backed real-time clock (RTC) keeps your Raspberry Pi projects accurate even if power is lost. Ideal for data-logging, clock-building, NTP servers, time-stamping, timers, and alarms.Equipped with a genuine DS3231 RTC, it integrates seamlessly with Raspberry Pi and benefits from native kernel support. A datasheet reveals the DS3231's reputation as an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal."This RTC outperforms others thanks to its internal crystal and compensating temperature sensor, which ensures minimal time drift by adjusting clock ticks. Our RTC guarantees precision with 100% genuine Maxim DS3231 chips.Compatible with any Raspberry Pi, including Pi 1 to Pi Zero, the fully assembled PCB connects easily to GPIO pins—no soldering needed. It keeps time for 5 years or more.Note: CR1220 coin cell battery not included; purchasing a battery is recommended for use with this product.