Data Logger Module with DS1307 + Micro-SD, Battery Backup, I2C/SPI

Lot of 5 Arduino UNO R3 Prototype Expansion Module

Current Sensor Module I2C High Side Power Monitor 12A Arduino STM32 INA226

Adafruit DS3231 Precision RTC Breakout

DS3231 RTC Module with 32kB Memory, I2C, Battery Backup

7pcs Mini 25 Points Breadboard Solderless Prototype Tie-point For Arduino

CANADUINO Arduino Pocket Calculator DIY Kit

3 x DS3231 RTC module, 32kB Memory, I2C interface, Battery Backup