About this item

• 1, Main chip DS3231 is a high precision RTC IC with I2C communication, it has integrated crystal oscillator and temperature sensor and hence you don't have to connect an external crystal or temp sensor
• 2, DS3231 RTC module can work on either 3.3V or 5V. You can use a typical CR-2-0-3-2 3V b-a-t-t-ery to power this RTC module
• 3, You need prepare C-R-2032 or L-I-R-2032 b-a-t-t-e-ry since it is not included in this listing
• 4,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