High Accuracy DS1307 I2C RTC Module with AT24C02 EEPROM for Arduino

Based on DS1307, this is high-precision real-time clock module. Onboard AT24C02 EEPROM, you can record more alarms and events information. Onboard CR1220 battery holder, it is convenient to keep timing when main power to the device is interrupted.Features:- Compatibility: Compatible with Arduino UNO R3 / Arduino Mega2560- Working voltage: 4.5 - 5.5V DC- Working Current: 3mAh (Max)- Interface: standard I2C interface- Timing accuracy: ± 10ppm- SQW is programmable square wave output pin- Arduino Library: RTC- Great for Arduino DIY projectGeneralBrandOPEN-SMARTModel-Quantity1 pieceForm ColorRed + BlackMaterialPCB + Alloy + PlasticSpecificationEnglish Manual / SpecYesDownload Link https://drive.google.com/folderview?id=0B6uNNXJ2z4CxZmI1aVZpR1Q2eGs&usp=sharingPacking List1 * ModulePackage Weight:0.014kg (0.031lb)Package Size:5.5cm x 3.2cm x 2.5cm (1.97in x 1.18in x 0.79in)