Some say fake, some say genuine. Which is it?

Here is the problem, Amazon reviews are by the product name, not seller. So you will see reviews for both fake and real. If it's coming from China, rest assured it is a fake. If it's less than ~$18, it is most likely a fake. I purchased from mp3car store for about $19 and I received a genuine Arduino. Also keep in mind there are some legitimate clones that are perfectly legal, provided they do not use the Arduino name on the board - they may may use cheaper components (e.g. voltage regulator). But these ones on Amazon for around $12 are counterfeit since they use Arduino name and trademark and attempt to trick the buyer into thinking they got the real thing.It looks like Amazon has partially fixed the problem. Previously under "more buying choices" you would see the counterfeits. The tell tale sign was they were about $13. The have removed them, but you can still find them for sale under search term "Arduino Compatible". Amazon however should ban them from sale since they use Arduino name/trademark on board.Here is an example of a counterfeit board http://www.amazon.com/Development-Microcontroller-MEGA328P-ATMEGA16U2-Arduino/dp/B00G46X31W/ref=sr_1_11?s=electronics&ie=UTF8&qid=1392856538&sr=1-11&keywords=arduino+compatible

Does it come with USB connector?

No, genuine Arduino units do not include the USB connector. Some sellers are including USB cables with their 'knock off' boards, but selling them here on Amazon is against their terms of service.

how do I attach my USB plug to this board?

You can use a Micro B cable to plug in this board.

it says have 20 I/O pin. but in picture, there are only 13, how to make use of the rest of IO?

For the Leonardo, the AI pins (A0-A5) can be used as digital pins... See the Arduino website for more details. http://arduino.cc/en/Main/arduinoBoardLeonardo

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Arduino A000057 Leonardo with Headers | Arduino Original Board

Arduino A000057 Leonardo with Headers | Arduino Original Board

Product ID: 156184998

Details

Brand
Arduino
CPU Model
None
Connectivity Technology
USB
Memory Storage Capacity
1 KB
Model Name
Arduino

⚡Atmega32u4 MCU for seamless USB integration

🔌Built-in USB communication, no extra processor needed

🎛️20 I/O pins with 7 PWM & 12 analog inputs

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1503346₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Code, Create, Conquer – The USB-Ready Arduino Leonardo for Next-Level Innovation

COMPACT YET MIGHTY - Lightweight 25g design fits anywhere in your creative workspace
VERSATILE I O ARSENAL - 20 digital pins including 7 PWM and 12 analog inputs for complex projects
ORIGINAL QUALITY ASSURANCE - Genuine Arduino board ensures reliability over clones
PLUG PLAY USB POWERHOUSE - Transforms into mouse, keyboard & serial COM port effortlessly
BEGINNER FRIENDLY SCALABLE - Perfect for novices but powerful enough for advanced prototyping

The Arduino Leonardo is a compact, original development board powered by the Atmega32u4 microcontroller, featuring built-in USB communication that allows it to emulate mouse and keyboard inputs without extra hardware. It offers 20 digital I/O pins (7 PWM capable, 12 analog inputs), making it ideal for both beginners and advanced makers. Lightweight and USB-powered, it delivers reliable performance backed by Arduino’s trusted quality.

Specifications

ASIN	B008A36R2Y
Best Sellers Rank	#1,684 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Microcontrollers
Box Contents	1 x Arduino Leonardo with Headers
Brand	Arduino
Brand Name	Arduino
CPU Model	None
Compatible Devices	Personal Computer
Connectivity Technology	USB
Country of Origin	Italy
Customer Reviews	4.6 out of 5 stars 802 Reviews
EU Spare Part Availability Duration	1 Years
External Testing Certification	Não aplicável
Global Trade Identification Number	08058333491141
Importer Contact Information	Robocraze, Ground Floor, 912/10 Survey no. 104 4th G street, Chelekare, Kalyan Nagar, Bengaluru - 560043
Item Dimensions L x W x H	7.6L x 2.5W x 5.1H Centimeters
Item Type Name	Arduino Original Board
Item Weight Unit of Measure	25 Grams
Manufacturer	Arduino, Arduino, St. James Avenue, Boston, Massachusetts, 02116, USA
Manufacturer Contact Information	Arduino, St. James Avenue, Boston, Massachusetts, 02116, USA
Manufacturer Part Number	A000057
Memory Storage Capacity	1 KB
Model Name	Arduino Leonardo
Model Number	A000057
Network Connectivity Technology	USB
Operating System	Linux
Packer Contact Information	Robocraze, Ground Floor, 912/10 Survey no. 104 4th G street, Chelekare, Kalyan Nagar, Bengaluru - 560043
Processor Brand	Atmel
Processor Count	1
RAM Memory Installed	2.5 KB
RAM Memory Installed Size	2.5 KB
RAM Memory Technology	DDR
Total USB Ports	1
UPC	722204635603 736104505607 701748716719 736104504761 727908488593 720405523866 722204636327 712141158563 736104505812
Unit Count	1 Count
Warranty Description	1 year manufacturer
Wireless Compability	802.11b

Reviews

M**.

Great for DIY projects

Good for money product

8.04.2021

T**Y

Genuine product

20.05.2021

R**L

Five Stars

i love it, i didnt really get it on time but its really good stuff, be sure to buy it from proto central - authorised distributor and i got very good response from them. its smaller than u think but it packs a punch

10.08.2014

P**J

Good one, made in Italy board

Good one, made in Italy board. yet to start full-fledged testing, basic tests went fine. Looks solid. fyi usb cable not included

20.03.2015

R**N

Nice Product

nice

13.04.2016

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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