[ Module][0.96inch OLED]:Made of 128x64 individual Yellow Blue OLED pixels.SSD1306 Driver Chip,controlled by I2C only need 2 wires.[1602 LCD]:with adjustable Backlight,display 2x16 characters.With Adapter Board,only need 4 I/O ports can control it. [Contact Sensor]:Contact it turns on,release it turns off.[Obstacle Avoidance Module]:used in robot obstacle avoidance,line count,black white line tracking.[8x8 Red Dot Matrix Display]:used to display characters and graphics,simple to control [1 Channel Relay Module]:Controlled by 5V digital output from microcontrolle,With power and relay action indicator.used as home appliance control.[PIR Motion Sensor]:Human body sensor lighting industrial automation and control, etc. [SG90 9G Servo Motor]:Applied to remote control helicopters, micro-robot,and boats. All kind of R/C Toys and experiments for Arduino.[DHT11]:Digital temperature and humidity sensor is a digital signal output with a calibrated temperature and humidity combined sensor [Soil Moisture Sensor]:Most sensitive to ambient humidity is generally used to detect moisture of soil.[JoyStick Module]:2-axis pushbutton rocker module by joystick potentiometer with (X, Y) 2 axis analog output, (Z) 1 button digital output.[Red LED Digital Tube]:Common Anode;Digital Display:4 Digit;4 Bit 7 Segment; [Ultrasonic Distance Sensor]:Using IO trigger for at least 10us high level signal,When triggered it sends out a series of 40KHz ultrasonic pulses and receives echo from an object colour:Blue Material:plastic Package Contents: 1 x 0.96 inch OLED Screen 1 x 1602 Liquid Crystal Display Module 1 x 1-Channel Relay Module 1 x DHT11 temperature and humidity sensor 1 x HC-SR04 Ultrasonic sensor 1 x 8x8 Dot Matrix Display 1 x JoyStick Module 1 x 4-digit Digital Tube 1 x TTP223B Contact sensor 1