Descriptions: 
<br />   
<br /> *ATmega16U2 chip alternative 8U2. Means a higher transfer rate and memory. 
<br /> *Stitching changes: beside the AREF sutural added two I2C pins (SDA and SCL, only analog copy of 4 and 5, 
<br />  not additional I2C interface), in addition, added two pins, one is IOREF which can let the extension board to board, 
<br />  load voltage, the stitching is tell extension board currently on-board voltage is how many, the other one is after 
<br />  treated with placeholder pins. 
<br /> *The RESET circuit is more stable. RESET button position is changed, and moved to near the USB interface
<br />  of voids, it is more convenient. 
<br /> *ATmega16U2 instead of 8 u2, this does not mean that there are 16k flash R3 can make your code run faster, the 
<br />  update service for the USB interface chip, it make UNO can simulate USB HID in theory, such as MIDI / Joystick / Keyboard. 
<br /> *Support ISP download function. 
<br /> *Using Atmel Atmega328 microprocessor controller. 
<br /> *Color: Black(As pictures show) 
<br /> *Digital I/O digital inputs/outputs were: 0~13 
<br /> *Analog I/O analog input/output: 0~5 
<br /> *External power supply: 7V to 12V DC input voltage 
<br /> *Output voltage: 3.3V and 5V DC 
<br />   
<br /> Package including: 
<br />   
<br /> 1 * UNO R3 ATMEGA328P ATMEGA16U2 Board 
<br /> 1 * USB Cable 
<br />   
<br /> Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors 
<br />such as brightness of your monitor and light brightness.<p> <b><b><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-1-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-2-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-3-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-4-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-5-large.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/59fa924ca2ef55574bbae74c-6-large.jpg></b></b></p>