Welcome to our shop! The module we have is a low-cost, high-precision I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. It is designed to provide accurate timing even when the mains supply is disconnected, thanks to its battery input port. The integrated crystal oscillator ensures long-term accuracy of the device. It comes in both commercial and industrial temperature ranges, and is packaged in a 16-pin 300 mil SO package. This clock module is made of high-quality ABS material, ensuring its strength and durability. Apart from its primary function as a real-time clock, it also offers additional features and options that can enhance the capabilities of the system host. Specification: - Material: ABS - Size: Approx. 3.8x2.2x1.2cm/1.50x0.87x0.47inch - Working Voltage: 3.3-5.5V - Clock Chip: High precision clock chip - Clock Accuracy: Under 0-40℃ accuracy 2ppm, annual error of about 1 minute - 2 calendar alarm clocks - Programmable square wave output - The real-time clock generates seconds, minutes, hours, weeks, dates, months, and years, and provides leap year compensation that is valid until 2100 - The chip has its own temperature sensor with an accuracy of ±3℃ - Memory Chip: AT24C32 (storage capacity 32K) - IIC Bus Interface: Transmission speed 400KHz (when the working voltage is 5V) - Battery: CR2032 (included) 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.