Description: Low-cost, extremely accurate I2C real-time clock (RTC). DS1307 chip and CR1220 button battery ensure accurate timekeeping for a long time after power failure. Real-time clock counts seconds, minutes,hours, day, date, month, and year with leap year compensation valid up to 2100. Rechargeable battery CR1220, preventing the system from power failure. Specification: Size: Approx. 20 x 10mm / 0.8 x 0.4inch Accuracy: ±2ppm within 0 °C to +40 °C Chip: DS1307 Battery: CR1220 button battery (not included) Work temperature: -10 °C to +85 °C Can be operated directly with a shell script. Product interfaces: Raspberry Pi B 2X13 socket; Raspberry Pi A+/B+/2 Model 2X20 socket; Support Raspberry Pi B/A+/B+/2; 2*5p 2.54mm spacing interface; Package Includes: 1 Piece RTC Clock Module (not including battery)
