WayinTop Real Time Clock Kit with Tutorial for Arduino Nano, DS3231 AT24C32 Clock Module + Micro SD Card Driver + Nano…

Amazon.com Price: $17.99 (as of 23/11/2020 03:35 PST- Details)

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【DIY Digital Clock Kit】You can use this kit to build a real time clock and timing alarm clock using Arduino DS3231RTC and SSD1306 OLED. The little component are all included, such as breadboard, jumper wires, active buzzer, and switch button, with which you can get started immediately.
【Clock Module 】The DS3231RTC is used as a real time clock chip which keeps the time running even if the main power supply is off (coin battery isn’t included).