Brand N/A Model TJUNO R3 Quantity 1 Color Multicolored Material Heavy gold plate Features Pin change: add I2C (SDA and SCL) near AREF pin and add 2 pin near RESET; More stable RESET circuit near USB connector convenient to press; ATmega16U2 replace 8U2 it doesnot mean 16K flash R3 make your code run faster it let UNO simulate USB HID in terms of theory for example:MIDI/Joystick/Keyboard Specification Microcontroller ATmega328 Operating Voltage 5V Input Voltage (recommended) 7-12V Input Voltage (limits) 6-20V Digital I/O Pins 14 (of which 6 provide PWM output) Analog Input Pins 6 DC Current per I/O Pin 40 mA DC Current for 3.3V Pin 50 mA Flash Memory 32 KB (ATmega328) of which 0.5 KB used by bootloader SRAM 2 KB (ATmega328) EEPROM 1 KB (ATmega328) Clock Speed 16MHz Application Arduino starter learning kit English Manual/Spec http://arduino.cc/en/Main/Software Packing List 1 x UNO R3 main board 1 x Development board 1 x Bread board 5 x Green LED 5 x Yellow LED 5 x Red LED 10 x 1k resistor 10 x 10k resistor 10 x 220ohm resistor 1 x 74HC595N chips 2 x Buzzers (passive and active) 1 x 1 digital tube 1 x 4 digital tube 4 x Big buttons 3 x Optical resistor 1 x Adjustable resistor 1 x Temperature and humidity module 1 x LM35 sensor module 1 x Infrared receiver 1 x Flame sensor 2 x Rocker switch 1 x Mini remote control (2 x AG10 battery included) 1 x 74HC595IC shift register 1 x 1602 LED 1 x Step motor(24cm/5V) 1 x ULM2003 drive board 1 x 9g Sero(25cm) 1 x 9V battery buckle (17cm) 1 x 9V Battery 30 x Bread board cable (19cm) 1 x USB cable (59cm)