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REAL TIME CLOCK This particular add on uses the GPIO but does not occupy it for you so you can add any other add on you need Battery Backed Up Realtime Clock and Calendar Add-On for Raspberry Pi SHIM RTC is a battery backed up realtime clock and calendar add on board for Raspberry Pi that does not get in the way of other add on boards providing easy, plug and play integration and development for designs and/or applications requiring time stamps. Board communicates via I2C interface, supported by a back-up battery to ensure on-going timekeeping operation in power-down situation The battery is not included in the package. The battery required for backup when the Raspberry Pi is powered down 1x CR1220 3V lithium coin cell battery required The product is compatible with Raspberry Pi - Model A Raspberry Pi - Model B Raspberry Pi - Model B+ 16 character by 2 line alphanumeric display Microchip MCP7940N Battery backed RTCC device Does not use up the Raspberry Pi GPIO headers Compatible with Raspberry Pi Models (A, B and B+) Works with 26 or 40 Raspberry Pi GPIO header pins Fits within Raspberry Pi footprint Add a real time clock for time stamping applications Will fit under most add-on boards I²C connection