1. The module is a low cost, high 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 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.

Spec:
Features:
The module is a low cost, high I2C real time clock (RTC) with integrated temperature compensated crystal oscillator (TCXO) and crystal.
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.
Both commercial and industrial temperature ranges are being provide, adopting a 16-pin 300 mil SO package.
This product is made of ABS material, strong and durable.
This clock module also has other functions that extend the additional features and options range 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 clock chip
Clock Accuracy: Under 0-40℃ accuracy 2ppm, annual error of about 1 minute
With 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: speed 400KHz (when the working voltage is