Seeed Studio (103030277) Real Time Clock, DS1307 and Battery Backup

Product InformationAccessory Type: Pi RTCFor Use With: Raspberry Pi 4Product Range: -Product OverviewThe Pi RTC is based on the clock chip DS1307, it can provide a real-timeclock(RTC) for raspberry pi via the I2C interface. Real-time clock of thismodule counts seconds, minutes, hours, date of the month, month, day of theweek, and year with leap-year compensation valid up to 2100. The clock operatesin either the 24-hour or 12-hour format with AM/PM indicator. If you want tokeep this module timing when the Raspberry Pi is powered off, you need to put a3-Volt CR1225 lithium cell in the battery-holder.Supports Raspberry Pi 2/ 3 B/B+ Zero/4Support seconds, minutes, hours, day of week, month, year56-byte, battery-backed, non-volatile (NV) RAM for data storageProgrammable square wave output signalAutomatic power-fail detect and switch circuitryDimension is 30mm x 23mm x 15mm