Link to this page: https://omnix.ie/21
This ISARE Real Time Clock (RTC) Module uses RX8900CE as its heart, and only has a footprint of 23x23mm (0.9x0.9 inch).
Arduino library will be provided.
Protocol: I2C
Battery needed: CR1220 (not included)
VCC: 3.3V-5V
Dimension: 23x23mm (0.9x0.9 inch)