UNO R3 board - generic - Top quality clone

Arduino is an open source computer hardware and software company, project, and user community that designs and manufactures single-board microcontrollers and microcontroller kits for building digital devices and interactive objects that can sense and control objects in the physical world. The project's products are distributed as open-source hardware and software, which are licensed under the GNU Lesser General Public License (LGPL) or the GNU General Public License (GPL),[1] permitting the manufacture of Arduino boards and software distribution by anyone. Arduino boards are available commercially in preassembled form, or as do-it-yourself (DIY) kits.

The UNO is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with. The UNO is the most used and documented board of the whole Arduino family.

Microcontroller                        ATmega328P
Operating Voltage                   5V
Input Voltage (recommended)  7-12V
Input Voltage (limit)                6-20V
Digital I/O Pins                        14 (of which 6 provide PWM output)
PWM Digital I/O Pins                6
Analog Input Pins                    6
DC Current per I/O Pin            20 mA
DC Current for 3.3V Pin           50 mA
Flash Memory                         32 KB (ATmega328P)

                                             of which 0.5 KB used by bootloader
SRAM                                     2 KB (ATmega328P)
EEPROM                                 1 KB (ATmega328P)
Clock Speed                           16 MHz
LED_BUILTIN                          13
Length                                   68.6 mm
Width                                     53.4 mm
Weight                                   25 g