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 Leonardo with Headers A000057 | ATmega32U4 Development Board with Native USB Support for Robotics, Automation & Embedded Projects, HID Device Emulation and Custom USB Interface Applications

Arduino Leonardo with Headers A000057 | ATmega32U4 Development Board with Native USB Support for Robotics, Automation & Embedded Projects, HID Device Emulation and Custom USB Interface Applications

Product ID: 156184998

Details

Brand
Arduino
CPU Model
None
Memory Storage Capacity
1 KB
Model Name
Arduino
RAM Memory Installed Size
2.5 KB

🎮HID device emulation

📊20 digital I/O pins

🔌Native USB support

B/.101

Duties & taxes included

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your innovation game with native USB wizardry!

VERSATILE I O ARSENAL - 20 digital pins including 7 PWM and 12 analog inputs for limitless project possibilities.
PLUG PLAY NATIVE USB - Seamlessly integrates as mouse, keyboard, or serial device—no extra converters needed.
ROBUST 16 M HZ ATMEL CORE - Power your automation and robotics with a reliable, high-speed microcontroller.
FUTURE PROOF YOUR PROJECTS - Ideal for IoT, embedded systems, and interactive installations that demand cutting-edge USB control.
ARDUINO ECOSYSTEM POWERHOUSE - Access extensive libraries, community support, and documentation to accelerate your build.

The Arduino Leonardo A000057 is a compact development board powered by the ATmega32U4 microcontroller featuring native USB communication. It supports HID device emulation, allowing it to act as a mouse, keyboard, or virtual serial device. With 20 digital I/O pins, including PWM and analog inputs, it’s perfect for advanced robotics, automation, and embedded projects. Backed by Arduino’s extensive ecosystem, it offers unmatched flexibility and community-driven resources for professional-grade prototyping.

Specifications

ASIN	B008A36R2Y
Best Sellers Rank	#4,040 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Microcontrollers
Box Contents	Arduino Leonardo with Headers
Brand Name	Arduino
CPU Model	None
Compatible Devices	Personal Computer
Country of Origin	Italy
Customer Reviews	4.6 4.6 out of 5 stars (817)
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 Leonardo
Item Weight Unit of Measure	25 Grams
Manufacturer	Arduino, St. James Avenue, Boston, Massachusetts, 02116, USA
Manufacturer Contact Information	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
Number of Items	1
Operating System	Linux
Packer Contact Information	Robocraze 9902340705
Processor Brand	Atmel
Processor Speed	16 MHz
RAM Memory Installed	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

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