Main Features:<br />Arduino UNO R3 is the new model open-source controller， the USB to serial port circuit is a ATMega16U2 single chip<br />The pin change: 2=I2C pin are added next to the AREF (SDA and SCL， it the same as Analog 4 and 5， no need other I2C interface)<br />2-pin are added next to the RESET， one is IOREF to let the expansion board adapt the on board voltage， they just show the on board voltage， the other is standby occupied pin<br />More stable RESET circuit， the RESET button is moved to the corner of board next to the USB interface， more convenient to press<br />ATmega16U2 replaces the 8U2， it is serviced for USB interface chip， to let the UNO analog USB HID， such as MIDI/ joystick/keyboard<br />Arduino starter kit， singlechip set<br /><br />    Specifications<br />General<br />  Model: XD-192965                                                  <br />                        Material: Immersion alloy plate                                                 <br />Weight and Size<br />  Product Weight: 0.21 kg                                                  <br />                        Package Weight: 0.43 kg                                                  <br />                        Product Size(L x W x H): 6.9 x 5.3 x 1.2 cm / 2.7 x 2.1 x 0.5 inches                                                  <br />                        Package Size(L x W x H): 23.5 x 16.5 x 6 cm                                                 <br />Package Contents<br />  Package Contents: 30 pin                                                 <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 />