Module Parameters:
1. Size: 38mm (L) * 22mm (W) * 14mm (H)
2. Weight: 7g
3. Packing: Anti-static packaging
4. Clock Chip: high-precision clock chip DS3231
5. Memory Chips:. AT24C32 (storage capacity of 32K)
6. Operating Voltage :3.3 - 5 .5 V
7. Clock Accuracy within Range: 0-40 ¡æ, accuracy 2ppm, about 1 minute in error
8. Chip Temperature Sensor Comes with an Accuracy of ± 3 °
9. Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation

Product Highlights
1. Programmable square-wave output
2. RST output/push button reset debounce input.
3. Two time-of-day alarms. Simple serial interface connects to most microcontrollers.
4. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
5. Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
6. With rechargeable LIR2032, to ensure the system after power failure, the clock move any natural normal

Wiring Instructions (for example):
SCL → A5
SDA → A4
VCC → 5V
GND → GND

Note:
1. Please use 3.0V CR2032!!!

2. not included, Because it's not safty to ship by air mail, so hope you can understand it.

Package Included: 5 x DS3231 Precision Clock Module