Main Features:<br />The real time clock has the ability of calculating prior to the 2100 seconds， points， week， month， year， and the ability to adjust a leap year<br />31 8-bit RAM<br />Wide working voltage: 2.0~5.5 V<br />When The working voltage is 2.0V， the current is less than 300nA<br />Read/write clock or RAM data have two transmission way: Single-byte / many bytes group<br />8 feet DIP assembly or optional 8 feet SOIC encapsulation according to surface assembly<br />Simple 3 line interface<br />Compatible with TTL<br />Double main and backup power supplies<br />Power LED indicator<br /><br />    Specifications<br />General<br />	 Type: Time clock module                                                	<br />Electronic Components<br />	 Input Voltage: 5V                                                  <br />                        Signaling Type: I2C                                                	<br />Power Batteries<br />	 Batteries Included: Yes                                                	<br />Weight and Size<br />	 Product Weight: 10 g                                                  <br />                        Package Weight: 0.050 kg                                                  <br />                        Product Size(L x W x H): 3.2 x 1.9 x 2.3 cm / 1.3 x 0.8 x 0.9 inches                                                  <br />                        Package Size(L x W x H): 5.0 x 3.0 x 3.0 cm                                                	<br />Package Contents<br />	 Package Contents: 1 x Time Clock Module， 1 x CR1220 Battery， 1 x Dupont Cable (21cm)                                                	<br /><br /><br /><br />                                                <br />