Color: Blue - Quantity: 1 - Material: PCB - Leads SQW / INT and 32KHz square wave output interface can output different frequency square wave output alarm interrupt. - Uses DS3231 high accuracy clock chipset (IIC interface speed rate 400kHz) - Set aside AT24Cxx IIC interface EEPROM memory interface. - Chip internal integrated precision 32.768KHz TCXO 2ppm accuracy within the range of 0'C to 40'C the year accuracy is about one minute. - Chipset internal temperature sensor accuracy is 3'C resolution is 0.5'C which can test environment temperature. - Soldered non-rechargeable 3.0V CR907 cell battery - Power port connected anti-reverse diode which can protect electric circuit. - Set power indicator - Can be cascaded to other IIC devices soldering 6P bend pins. - Great for DIY project.