Features 1.The module is a low cost, high precision I2C real time clock (RTC) with integrated temperature compensated crystal oscillator (TCXO) and crystal. 2.The device includes a battery input port that maintains accurate timing when the mains supply is disconnected. Integrated crystal oscillator improves long-term accuracy of the device. 3.Both commercial and industrial temperature ranges are being provide?, adopting a 16-pin 300 mil SO package. 4.This product is made of high quality ABS material, strong and durable. 5.This clock module also has other functions that extend the additional features and options range of the system host. specificationFeatures:_x000D_ _x000D_ The module is a low cost, high precision I2C real time clock (RTC) with integrated temperature compensated crystal oscillator (TCXO) and crystal. _x000D_ The device includes a battery input port that maintains accurate timing when the mains supply is disconnected. Integrated crystal oscillator improves long-term accuracy of the device. _x000D_ Both commercial and industrial temperature ranges are being provide, adopting a 16-pin 300 mil SO package. _x000D_ This product is made of high quality ABS material, strong and durable. _x000D_ This clock module also has other functions that extend the additional features and options range of the system host. _x000D_ _x000D_ :_x000D_ Material: ABS_x000D_ Size: Approx. 3.8x2.2x1.2cm/1.50x0.87x0.47inch_x000D_ Working Voltage: 3.3-5.5V_x000D_ Clock Chip: High precision clock chip_x000D_ Clock Accuracy: Under 0-40 accuracy 2ppm, annual error of about 1 minute_x000D_ With 2 calendar alarm clocks_x000D_ Programmable square wave output_x000D_ The real-time clock generates seconds, minutes, hours, weeks, dates, months, and years, and provides leap year compensation that is valid until 2100_x000D_ The chip has its own temperature sensor with an accuracy of 3_x000D_ Memory Chip: AT24C32 (storage capacity 32K)_x000D_ IIC Bus Interface: Transmission speed 400KHz (when the working voltage is 5V)_x000D_ Battery: CR2032 (included)_x000D_ _x000D_ Package List:_x000D_ 1 x Module PackageList