• Dimensions: 16.5mm x 26.3mm x 1.6mm
• Backup battery CR1220, voltage 3V, current 260mAh, non-rechargeable batteries. Theoretical data hold time is more than 10 years!
• Crystal 32.768KHz, matching capacitance 6pF, size 2 * 6mm
• DS1302 8-pin SMD homemade chips
• Module operating voltage compatible 3.3V/5V, can be connected with 5V and 3.3V microcontroller
• Operating temperature: 0 -70 degree

VCC2 → +5 V/3.3V
GND → GND
CLK → P02
DAT → P01
RST → P00​