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 instant USB magic!

ARDUINO IDE READY - Jumpstart innovation with full compatibility and access to a vast library of community-driven resources.
EXPANSIVE I O ARSENAL - 20 digital pins and 12 analog inputs empower complex, multi-sensor setups and PWM control.
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, versatile project performance.
SEAMLESS USB HID EMULATION - Transform your board into a custom keyboard, mouse, or game controller with native USB support.

The Arduino Leonardo features a 16 MHz ATmega32U4 microcontroller with 32KB flash memory, 20 digital I/O pins (7 PWM), and 12 analog inputs. Its standout feature is native USB HID support, enabling it to emulate keyboards, mice, and game controllers without extra hardware. Fully compatible with the Arduino IDE, it offers built-in USB communication for hassle-free programming, making it ideal for advanced prototyping and custom USB device projects.

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Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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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 with Arduino IDE for Custom Projects

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