Arduino IDE download link:
https://www.arduino.cc/en/Main/OldSoftwareReleases#previous
Note: If your pc can't recognize the board, pls update the driver in Arduino IDE folder for your PC.

Features:
Open circuit diagram of the original design, the development of software interface for free download.
Can also be in accordance with the requirements and their modified, download the program is simple and convenient.
Can simply use sensors, all kinds of electronic components connection (such as: LED lights, buzzer, buttons, photoresistance, etc.), make all sorts of interesting work.
Microprocessor controller, using high-speed development interface and the environment are very simple and easy to understand, very suitable for beginners to learn.

Performance Description:
Digital I/O Digital inputs/outputs: 0~13
Analog I/O Analog input/output: 0~5
Support ISP download function.
The input voltage: when connected to the computer USB without external power supply,external power supply 7v to 12v dc input voltage.
Output voltage: 3.3 V and 5 V dc voltage output dc voltage output.

Package Included:
1 x UNO R3 Board For Arduino

• Open circuit diagram of the original design, the development of software interface for free download.
• Can also be in accordance with the requirements and their modified, download the program is simple and convenient.
• Can simply use sensors, all kinds of electronic components connection (such as: LED lights, buzzer, buttons, photoresistance, etc.), make all sorts of interesting work.
• Microprocessor controller, using high-speed development interface and the environment are very simple and easy to understand, very suitable for beginners to learn.
• Support ISP download function.

Open circuit diagram of the original design, the development of software interface for free download.Gowoops