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 power!

ARDUINO IDE READY - Jumpstart innovation with full compatibility and access to a vast library ecosystem and community support.
PLUG PLAY USB HID - Seamlessly emulate keyboards, mice, and controllers with built-in USB HID support—no extra hardware needed.
VERSATILE I O ARSENAL - 20 digital pins and 7 PWM channels empower complex, multi-sensor setups and precise control.
DIRECT USB COMMUNICATION - Program and communicate effortlessly via native USB—ditch clunky converters and speed up your workflow.
POWERHOUSE MICROCONTROLLER - 16MHz ATmega32U4 delivers smooth, efficient processing for your most ambitious projects.

The Arduino Leonardo features a 16MHz ATmega32U4 microcontroller with 32KB flash, 2.5KB SRAM, and 1KB EEPROM. It supports native USB HID, allowing it to emulate keyboards, mice, and game controllers without extra hardware. Equipped with 20 digital I/O pins (7 PWM) and 12 analog inputs, it offers versatile connectivity for complex projects. Built-in USB communication simplifies programming, and full Arduino IDE compatibility ensures rapid prototyping and access to extensive community resources.

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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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