I2C DS1307 Real Time Clock Module for Arduino<br /><br />Main Features:<br />● Use maxim DS1307 chip<br />● Compatible with the Raspberry Pi model B / B+ / A+ and Raspberry Pi 2 model B<br />● CR1220 button cell can be replaced<br />● Battery backup input for continuous time keeping<br />● Real-time clock counts seconds， minutes， hours， day， date， month， and year with leap year compensation valid up to 2100<br />● You can set a serial port connector<br />● Programmable square-wave output signal<br />● Automatic power-fail detect and switch circuitry<br />● Programmable square-wave output signal<br /><br />    Specifications<br />General<br />  Type: Real Time Clock Module                                                  <br />                        Compatibility: Ardunio                                                 <br />Weight and Size<br />  Package weight: 0.412 kg                                                  <br />                        Product Size(L x W x H): 16.500 x 11.000 x 1.000 cm / 6.496 x 4.331 x 0.394 inches                                                  <br />                        Package Size(L x W x H): 19.500 x 13.500 x 6.500 cm / 7.677 x 5.315 x 2.559 inches                                                 <br />Package Contents<br />  Package Contents: 1 x I2C DS1307 Real Time Clock Module                                                 <br /><br /><br /><br />                                            <br /><br /><br /><br /><br /><br /><br />                       <br />Product Safety Disclaimer: <br />We do not accept any responsibility or liability for misuse of this or any other product.  All our products are extensively tested to comply with rigorous and strict QC standards.  For certain products (e.g. toys， knives， etc.)， we recommend proper supervision as we cannot be held liable for misuse or accidents.<br /><br />                                                <br />