Main Features:<br />Added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin， the IOREF that allow the shields to adapt to the voltage provided from the board<br />Reliable RESET circuitry<br />ATmega 16U2 (upgraded from 8U2)<br />The Uno revision3 driver can be found in the Arduino SDK package， at the following path: arduino-xxx\drivers\Arduino UNO REV3<br /> <br />Frequently Asked Questions: <br />Q1. Why are these called "Arduino Compatible"? <br />A1. The Arduino group demanded us to remove their logos and rename these products so that they do not lead customers to believe they are the same units sold by Arduino<br />Q2. Are these 100% compatible with the "normal" Arduino's? <br />A2. Yes， they really are completely compatible with "normal" Arduino's. Build quality looks the same and everything (studio， library， tools， etc) just works<br /><br />    Specifications<br />General<br />	 Type: Development board                                                  <br />                        Model: Arduino Uno R3 Rev3                                                	<br />Electronic Components<br />	 Architecture: Arduino/AVR                                                  <br />                        Input Voltage: 7-12V                                                  <br />                        Operating Voltage: 5V                                                  <br />                        PCB Size: 75 x 53 mm                                                	<br />Microprocessors<br />	 Digital I/O Channels: 14                                                	<br />Weight and Size<br />	 Product Weight: 0.055 kg                                                  <br />                        Package Weight: 0.150 kg                                                  <br />                        Product Size(L x W x H): 7.5 x 5.3 x 1.2 cm/ 3.0 x 2.1 x 0.2 inces                                                  <br />                        Package Size(L x W x H): 10.0 x 8.0 x 4.0 cm                                                	<br />Package Contents<br />	 Package Contents: 1 x Development Board                                                	<br /><br /><br /><br />                                                <br />