The most economical way to starting programming for those beginners who are interested in electronics Upgraded with a power supply module and 9V battery with DC for added convenience and versatility High-quality UNO R3 controller board (Arduino-compatible) for reliable and efficient performance Comprehensive tutorial included to guide you through the basics and beyond Lightweight and portable package weighing just 612.35 grams for easy storage and transport ELEGOO Inc. is a professional manufacturer and exporter that is concerned with the design, development production and marketing of Open source hardware, 3d printers and STM32. Component listing: 1pcs UNO R3 Controller Board Compatible with Arduino IDE 1pcs LCD1602 Module ( with pin header) 1pcs Breadboard Expansion Board 1pcs Power Supply Module WARNING: Pls. do not use the voltage higher than 9V 1pcs Joystick Module 1pcs IR Receiver 1pcs Servo Motor (SG90) 1pcs Stepper Motor 1pcs ULN2003 Stepper Motor Driver Board 1pcs Ultrasonic Sensor 1pcs DHT11 Temperature and Humidity Module 1pcs 9V Battery with DC 1pcs 65 Jumper Wire 1pcs USB Cable 1pcs Active Buzzer 1pcs Passive Buzzer 1pcs Potentiometer 1pcs 5V Relay 1pcs Breadboard 1pcs Remote 1pcs Tilt Switch 5pcs Button (small) 1pcs 1 digit 7-segment Display 1pcs 4 digit 7-segment Display 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 IC 74HC595 120pcs Resistor 10pcs Female-to-male Dupont Wire