Features：
1.Fully compatible with official software, sensors, and code; UNO R3 is a single-chip development board based on the Atmega328 microcontroller. It features 14 onboard digital I/O ports (numbered 0 to 13, with 6 ports supporting PWM signal output); 6 analog input ports (capable of serving as both digital signal input and output ports) labeled A0 to A5; a 16MHz crystal oscillator; a USB interface; a DC power socket; an ICSP header; and a reset button.
2.The Arduino boards can be used as the brains behind almost any electronics project. Arduino can interact with buttons, LEDs, motors, speakers, GPS units, cameras, the internet, and even your smart-phone or your TV! 
3.By connecting the Arduino board with a personal computer via a USB cable and uploading to the board, users can create digital devices and interactive objects that can sense and control objects in the physical and digital world like robots or even honest fortune-telling machines. 
4.It’s a good choice and perfect gift for kids, teens, adults or whoever is obsessed with electronics, programming or robotics to take their first steps on electronics journey.
5.Power Supply Options for the UNO Development Board:
    a.USB Power Supply: Power can be provided through the USB port, and in this mode, the programmed code can be downloaded to the development board.
    b.DC Power Input: Power can be supplied through the DC power input interface, the circular socket on the development board. It is important to note that the external input voltage should be between 7V and 12V. Typically, two series-connected 18650 batteries are suitable.
    c.Power Supply via 5V or VIN Ports: Power can be supplied through the 5V or VIN ports at the power interface. The voltage supplied to the 5V port must be stable at 5V, while the VIN port accepts power in the range of 7V to 12V.

Details：
1.Unit weight: 0.54kg ,1.2 pounds
2.Voltage: 7V - 12V
3.Country of origin: China

Package Includes:

5pcs White LED
5pcs Yellow LED
5pcs Blue LED
5pcs Green LED
5pcs Red LED
1pcs RGB LED
2pcs Photoresistor
1pcs Thermistor
2pcs Diode Rectifier (1N4007)
2pcs NPN Transistor (PN2222)
1pcs Tilt Switch
5pcs Button (small)
1pcs 1 digit 7-segment Display
1pcs 4 digit 7-segment Display
1pcs Sound Sensor Module
1pcs LCD1602 Module ( with pin header)
1pcs IC L293D
1pcs IC 74HC595
1pcs Active Buzzer
1pcs Passive Buzzer
1pcs DHT11 Temperature and Humidity Module
1pcs Potentiometer
1pcs Joystick Module
1pcs Membrance Switch Module
1pcs 5V Relay
1pcs IR Receiver Module
1pcs R3 Controller Board
1pcs 830 Point Breadboard
1pcs Servo Motor (SG90)
1pcs Stepper Motor
1pcs ULN2003 Stepper Motor Driver Board
1pcs Prototype Expansion
1pcs Power Supply Module (WARNING: Pls. do not use the voltage higher than 9V)
1pcs Ultrasonic Sensor
1pcs 3V Servo Motor(Soldered Wire)
1pcs Fan Blade
1pcs Remote
1pcs 65 Jumper Wire
1pcs Water Lever Sensor
1pcs USB Cable
1pcs 9V Battery Connector with DC
10pcs Resistor (10R)
10pcs Resistor (100R)
10pcs Resistor (220R)
10pcs Resistor (330R)
10pcs Resistor (1K)
10pcs Resistor (2K)
10pcs Resistor (5K1)
10pcs Resistor (10K)
10pcs Resistor (100K)
10pcs Resistor (1M)
10pcs Female-to-male Dupont Wire
1pcs Resistance Identification Card
1pcs Totutial Card