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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🚀 Unlock your creative genius with Arduino Leonardo — where innovation meets seamless USB magic!

PLUG PLAY USB HID - Emulate keyboards, mice, and controllers effortlessly with built-in USB device capabilities.
COMPACT LIGHTWEIGHT - Slim 7.62 x 2.54 cm footprint and just 25g—perfect for sleek, portable custom builds.
VERSATILE I O ARSENAL - 20 digital pins and 12 analog inputs empower complex, multi-sensor setups and PWM control.
SEAMLESS IDE INTEGRATION - Fully compatible with Arduino IDE for rapid prototyping and access to a vast developer community.
POWERHOUSE MICROCONTROLLER - 16 MHz ATmega32U4 delivers smooth, efficient processing for your most ambitious projects.

The Arduino Leonardo features a 16 MHz ATmega32U4 microcontroller with 32KB flash memory and native USB HID support, enabling it to emulate USB devices like keyboards and mice. It offers 20 digital I/O pins (7 PWM capable), 12 analog inputs, and built-in USB communication, all fully compatible with the Arduino IDE for fast, flexible prototyping in compact form.

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Brand	Arduino
Product Dimensions	7.62 x 2.54 x 5.08 cm; 25 g
Item model number	A000057
Manufacturer	Arduino
Series	Leonardo
Processor Brand	Arduino
Processor Type	None
Processor Speed	16 MHz
Processor Socket	DIP
Processor Count	1
RAM Size	2560 Bytes
Memory Technology	DDR
Computer Memory Type	SRAM
Memory Clock Speed	16 MHz
Graphics Card Interface	Integrated
Wireless Type	802.11b
Voltage	5 Volts
Are Batteries Included	No
Number of Lithium Metal Cells	1
Item Weight	25 g
Guaranteed software updates until	unknown

Arduino Leonardo with Headers [A000057] � ATmega32U4 Microcontroller, 16MHz, 20 Digital I/O Pins, 7 PWM, USB HID Support, Built-in USB Communication, Compatible IDE for Custom Projects

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