Features: The PCF8563T Real Time Clock Module delivers precise timekeeping (±3 minutes/year) with 1.0V 5.5V wide voltages compatibility, outperforming DS3231 in rtcs performances while consuming minimal power for microcontroller projects. Featuring automatic temperature compensation, I2C interfaces communication, and integrated alarm/timer functions, this high reliability rtcs module maintains clock stability across industrial environment and IoT applications. Ideal for electronics engineers, developers, and DIY enthusiasts requiring accurate time synchronization in automation systems, data loggers, or home devices. Perfectly suited for missions critical applications including industrial control panel, IoT sensors networking, and energy efficient portable equipment where consistent rtcs performances is essential. Engineered with components and pre loaded sample codes, this Real Time Clock Module ensures plugs and play integration for seamlessly time management solution in prototyping and production environment. Specifications: Component:Plastic Size:Approx.4.3x1.7cm/1.69x0.67inch Option Type:1pc,3pcs; Wide voltages ranges:1.0~5.5V Programmable clock output frequencies:32.768KHz, 1024Hz, 32Hz, 1Hz Package Includes: Package A 1pc PCF8563T I2C Clock Module (without Battery) Package B 3pcs PCF8563T I2C Clock Module (without Battery) note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.