The DS1302 Real Time Clock Module has an SPI interface through which it can tell the time.
1.PCB a single panel, size: 42mm * 24mm * 12mm(max)
2 with 4 holes, about 3.1mm in diameter
3 Crystal 32.768KHz, matching capacitance 6pF, size 2 * 6mm
4.DS1302 made large 8-pin DIP chip, chip, IC Block below for easy replacement and plug the chip
5 module operating voltage compatible 3.3V / 5V, 5V and 3.3V microcontrollers can be connected with