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, USB HID Support, Built-in USB Communication, Compatible with Arduino IDE for Custom Projects

Product ID: 56050266

Details

Brand
Arduino
CPU model
None
CPU speed
16 MHz
Memory storage capacity
1 KB
Model name
Leonardo

⚡16 MHz ATmega32U4 MCU

📟20 Digital I/O pins + 7 PWM outputs

🔌Built-in USB HID & communication

A$59

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Prototype like a pro, code like a wizard!

ARDUINO IDE READY - Jumpstart your innovation with full compatibility and access to a thriving community and libraries.
EXPANSIVE I O ARSENAL - 20 digital pins and 12 analog inputs empower you to build intricate, multi-sensor systems.
PLUG PLAY PROGRAMMING - Built-in USB communication means no extra converters—just connect and code instantly.
POWERHOUSE MICROCONTROLLER - Harness the 16 MHz ATmega32U4 for lightning-fast prototyping and complex projects.
SEAMLESS USB HID EMULATION - Transform your board into a custom keyboard, mouse, or game controller with native USB support.

The Arduino Leonardo with Headers (A000057) is a versatile microcontroller board powered by the 16 MHz ATmega32U4 chip, featuring 20 digital I/O pins (7 PWM), 12 analog inputs, and built-in USB HID support. Its native USB communication enables it to emulate devices like keyboards and mice, eliminating the need for external converters. Fully compatible with the Arduino IDE, it offers a seamless development experience for makers and professionals aiming to create custom USB peripherals and complex IoT projects.

Specifications

ASIN	B008A36R2Y
Best Sellers Rank	24,970 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 126 in Motherboards
Box Contents	microprocessor
Brand Name	Arduino
CPU Model	None
Compatible Devices	Personal Computer
Country of Origin	Italy
Customer Reviews	4.7 4.7 out of 5 stars (822)
EU Spare Part Availability Duration	1 Years
External Testing Certification	Não aplicável
Global Trade Identification Number	08058333491141
Item Dimensions L x W x H	7.6L x 2.5W x 5.1H centimetres
Item Weight	25 Grams
Manufacturer	Arduino
Manufacturer Part Number	A000057
Memory Storage Capacity	1 KB
Model Name	Leonardo
Model Number	A000057
Network Connectivity Technology	Ethernet, USB
Number of Items	1
Operating System	Linux
Processor Brand	Arduino
Processor Speed	16 MHz
RAM Memory Technology	DDR
Total USB Ports	1
UPC	722204635603 736104505607 701748716719 736104504761 727908488593 720405523866 722204636327 712141158563 736104505812
Wireless Compability	802.11b

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