The PCF8563 RTC Board with Extended Fittings - Raspberry Pi RoHS is a real-time clock (RTC) board from Waveshare that is manufactured for use with the Raspberry Pi. It has a PCF8563 Real Time Clock IC and several other components, including a reference battery, quartz crystal oscillator, ceramic resonator, frequency trimming capacitor, power indicator LED, external power supply Led, and more. It also includes extended fittings, such as an I2C connector, reset switch, and address select jumpers, providing extra features to the main RTC board. It meets RoHS standards, meaning that it is environmentally friendly. This board is ideal for anyone who is looking for a reliable and precise RTC board for their Raspberry Pi project.