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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Description

🚀 Elevate Your Projects with Arduino Magic!

GLOBAL INNOVATION - Proudly made in Italy, the Arduino Leonardo is a staple for makers worldwide.
COMPACT POWERHOUSE - Lightweight at just 25g, this board is perfect for projects on the go.
SEAMLESS INTEGRATION - Built-in USB communication means no extra processor needed—just plug and play!
VERSATILE CONNECTIVITY - Appears as a mouse, keyboard, and serial port to your computer for ultimate flexibility.
UNLEASH YOUR CREATIVITY - With 20 digital I/O pins, including 7 PWM outputs, the possibilities are endless!

The Arduino A000057 Leonardo is a versatile microcontroller board featuring 20 digital I/O pins, built-in USB communication, and the ability to emulate a mouse and keyboard. Weighing only 25g, it’s designed for easy integration into various projects, making it a favorite among tech enthusiasts and professionals alike.

Specifications

Brand	Arduino
Manufacturer	Arduino
Country of Origin	Italy
Model number	A000057
Colour	Multi
Number of Memory Sticks	1
Item Weight	25 g
Product Dimensions	7.62 x 2.54 x 5.08 cm; 25 g
Item model number	A000057
Item Height	2 Inches
Item Width	1 Inches
Auto Focus Included	No
Processor brand	Atmel
Number of processors	1
Memory Storage Capacity	1 KB
Memory Technology	DDR
Memory clock speed	16 MHz
Hard Disk Interface	USB
Wireless Standard	802.11b
Number of USB Ports	1
Connectivity Technology	USB
Voltage	5 Volts
Compatible Device	Personal Computer
Included Components	Arduino Leonardo with Headers
Are batteries included?	No
Number of lithium metal cells	1
Hardware Interface Type	USB
External Certification	Não aplicável

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