uxcell DS1302 RTC Real Time Clock Module for AVR ARM PIC Product Name : DS1302 I2C RTC Real Time Clock Module;Frequency : 32.768KHZ Pin Numbers : 5Pins;Powered : 1 x 3V CR2032 Battery(Battery not included) Total Size : 44 x 23x 12mm/1.7" x 0.91" x 0.47"(L*W*H);Mounting Hole Diameter(Each) : 3mm/ 0.12" Material : PCB, Plastic, Electric Parts;Main Color : Green, Black Weight : 10g;Package : 1 x DS1302 I2C RTC Real Time Clock Module