SunFounder PCF8563 IIC I2C Real Time Clock RTC and DS18B20 Temperature Sensor Module for Arduino Raspberry Pi Integrates RTC PCF8563 and DS18B20 temperature sensor. Provides battery backup for continuous timekeeping; Low power consumption. Complete clock calendar functions include second, minute, hour, day, date, month and year timekeeping, which provides valid time until the year 2100 with leap year compensation. Supports PCF8563 I2C output and DS18B20 digital output, so you just plug the ports into Raspberry Pi to use. Working voltage: 3.3V; Dimensions: approx. 14*13*15mm/0.55*0.51*0.59.