Adafruit DS3231 Precision RTC FeatherWing

Key Features: Add an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO) to any Feather main board The crystal is inside the chip Built-in temperature sensor compensates for the frequency changes by adding or removing clock ticks so that the timekeeping stays on schedule CR1220 battery required - not included A Feather board without ambition is a Feather board without FeatherWings! This is the DS3231 Precision RTC FeatherWing: it adds an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO) to any Feather main board. This RTC is the most precise you can get in a small, low power package. Using our Feather Stacking Headers or Feather Female Headers you can connect a FeatherWing on top of your Feather board and let the board take flight!This RTC is in a beefy package because the crystal is inside the chip! And right next to the integrated crystal is a temperature sensor