flashtree 2Pcs DS1302 RTC Real Time Clock Module for Arduino No Battery breakout

The real-time clock has the ability to calculate seconds, minutes,hours, days, weeks, months, and years before 2100, as well as theability to adjust for leap years. - 31 8-bit temporary data storage RAM - Serial I/O port mode minimizes the number of pins - Wide range of operating voltage 2.0, 5.5V - Working current 2.0V, less than 300nA - Thereare two transfer methods for single-byte transfers and multi-bytetransfer bursts when reading or writing clock or RAM data - 8-Pin DIP Package or Optional 8-Pin SOIC Package Based on Surface Mount - Simple 3-wire interface - Compatible with TTL Vcc=5V - Dual power supply for main and backup power supplies