Description： This is an upgrade version UNO R3 starter kit, add more components to achieve more features and experiment. You\'ll learn through building several projects. Starting the basics of electronics, to do more complex projects, the kit will help you control the physical world with sensor and actuators. Component list: 1 x UNO R3 development board 1 x USB cable 1 x Prototype extension board 1 x Mini breadboard 1 x 5V stepper motor 1 x 2003 stepper motor driver board 5 x Red LED 5 x Green LED 5 x Yellow LED 2 x Vibration Sensor 1 x Flame sensor 1 x LM35 temperature sensor 1 x Infrared receiver 3 x Photoresistor 4 x Key cap 4 x Key switch 1 x Adjustable potentiometer 1 x Passive buzzer 1 x Active buzzer 1 x Jumper cap 1 x Large breadboard 1 x Remote Control 1 x 1602 Screen 1 x 9G servos 1 x Component box 1 x 10p DuPont line 30 x Breadboard line(approximately) 1 x 220ohm resistance 1 x 8*8 dot matrix 1 x One digit eight segment tube 1 x Four digit eight segment tube 1 x 74HC595 1 x Battery Holder 1 x 1K resistor plug 1 x 10K resistor plug 1 x 9V battery 1 x 2.54mm 40pin pin header