Keyestudio DS3231 High precision I2C real time Clock Module for Arduino

• 1)Temperature range: -40 to +85; Timing accuracy : ± 5ppm (±0.432 seconds / day)
• 2)Provide battery backup for continuous timing
• 3)Low power consumption
• 4)Device package and function compatible with DS3231
• 5)Complete clock calendar function contains seconds and minutes, hour, week, date, month, and year timing and provides leap year compensation until 2100.
• 6)Two calendar clock
• 7)Output: 1Hz and 32.768kHz
• 8)Reset output and Input Debounce of Pushbutton
• 9)High speed  (400kHz), I2C serial bus
• 10)Supply voltage: +3.3V to +5.5V
• 11)Digital temperature sensor with a precision of±3℃
• 12)Working temperature: -40 ~ C to +85 ~ C 
• 13)16 pins Small Outline Package (300mil)

Arduino software
WIKI page tutorial