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 Microcontroller, 16MHz, 20 Digital I/O Pins, 7 PWM, Built-in USB HID Communication, Compatible with Arduino IDE for Custom Projects

Product ID: 1955480

Details

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

⚡16MHz ATmega32U4 MCU

🔌Built-in USB HID support

🔢20 Digital I/O pins + 7 PWM

Bs.908

Duties & taxes included

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Description

🚀 Unlock next-level DIY innovation with Arduino Leonardo — where creativity meets USB power!

VERSATILE I O ARSENAL - 20 digital pins and 12 analog inputs let you connect sensors, LEDs, and actuators without limits.
SEAMLESS USB HID EMULATION - Transforms your projects into custom keyboards, mice, or game controllers with native USB support.
PLUG PLAY WITH ARDUINO IDE - Instant compatibility with the world’s leading open-source platform accelerates your prototyping workflow.
ROBUST 16 M HZ A TMEGA 32 U 4 CORE - Powerful microcontroller with 32KB flash and 2.5KB SRAM for complex, responsive applications.
COMPACT BREADBOARD FRIENDLY - Slim profile with sturdy headers makes integration and iterative design effortless and stylish.

The Arduino Leonardo is a compact, professional-grade microcontroller board powered by the ATmega32U4 running at 16MHz. It uniquely supports native USB communication, enabling it to emulate keyboards, mice, and other HID devices without extra hardware. Featuring 20 digital I/O pins (7 PWM capable), 12 analog inputs, and seamless Arduino IDE compatibility, it’s designed for advanced prototyping and custom USB peripheral projects. Its built-in USB interface eliminates the need for external converters, making it a top choice for makers seeking flexible, powerful, and streamlined development.

Specifications

ASIN	B008A36R2Y
Best Sellers Rank	#1,228 in Single Board Computers (Computers & Accessories)
Brand	Arduino
Built-In Media	User Manual
CPU Model	None
CPU Speed	16 MHz
Compatible Devices	Personal Computer
Connectivity Technology	Ethernet, USB
Customer Reviews	4.8 out of 5 stars 831 Reviews
EU Spare Part Availability Duration	1 years
External Testing Certification	Não aplicável
Global Trade Identification Number	08058333491141
Item Dimensions L x W x H	3"L x 2"W x 1"H
Item Weight	25 g
Manufacturer	Arduino
Memory Storage Capacity	1 KB
Mfr Part Number	A000057
Model Name	Leonardo
Model Number	A000057
Number of Items	1
Operating System	Linux
Processor Brand	Atmel
Processor Count	1
Processor Speed	16 MHz
RAM Memory Installed	2.5 KB
RAM Memory Technology	DDR
Ram Memory Installed Size	2.5 KB
Total Usb Ports	1
UPC	722204635603 736104505607 701748716719 736104504761 727908488593 720405523866 722204636327 712141158563 736104505812
Unit Count	1 Count
Wireless Compability	802.11b

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