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. That sensor compensates for the frequency changes by adding or removing clock ticks so that the timekeeping stays on schedule. With a CR1220 12mm coin cell plugged into the top of the FeatherWing, you can get years of precision timekeeping, even when main power is lost. Great for datalogging and clocks, or anything where you need to really know the time.
Item Specifics Size: 2" x 0.9" x 0.06"
Weight: 4.8 g CR1220 coin cell is required to use the battery-backup capabilities (not included)