5PCS DS3231 Real Time Clock Module RTC Sensor High Precision AT24C32 IIC Timer Alarm Clock for Arduino Raspberry Pi

• Voltage: 3.3-5V, Memory chips: AT24C32 (storage capacity 32K)
• Document link: http://tronixlabs.com/breakout-boards/real-time-clock/ds3231-real-time-clock-module/
• About battery type: Battery is not included, you can use CR2032 or LIR2032 battery
• Feature: The DS3231 is an RTC IC developed by Maxim Integrated. It is a low cost, extremely accurate RTC IC with communication over I2C Interface. An interesting feature of DS3231 RTC IC is that it has integrated crystal oscillator and temperature sensor and hence you don’t have to connect an external crystal.
• Clock chip: high-precision clock chip DS3231(there are 3 different chips for this clock module, DS3231N,DS3231SN and DS3231M, we send it by randomly.