Adafruit-FRAM-Breakout-I2C-Non-Volatile-256 Kbit-32 K Byte-Adafruit-1895-P-The-Adafruit-I2C-Non-Volatile-256 Kbit-32 K Byte-FRAM-breakout-gives-your-next-project-fast-persistent-storage-using-cool-new-ferroelectric-RAM-technology-It-s-low-power-has-a-fast-write-speed-&-each-location-can-be-written-to-10-trillion-times-Once-written-data-will-be-kept-safe-for-95-years-at-room-temperature-though-there-may-not-be-Arduinos-then-The-I2C-interface-runs-at-1 M Hz-&-the-board-is-happy-with-3