Features: 1. Easy To Use 2. Contains A Lot Of Sensors 3. Variable Development Board 4. Packed In A Plastic Box For Easy Storage, It Is Easy To Organize And Store Your Components, Making Your Work Space Neat And Orderly. 5. Easy To Carry Description: Set: B / A Style: 830-Hole Breadboard (Include for Uno R3 Motherboard) / (Excluding for Uno R3 Motherboard) Type: Suitable For Uno R3 Development Board Material: Plastic+PCB+Metal colour: As shown Package Contents: 1 x for UNO development board 1 x 830 breadboard 1 x USB cable 1 x LM35DZ sensor 2 x 5528 photoresistors 1 x water level sensor module 1 x 1 digit display tube 1 x sound module 1 x RGB 3-color module 1 x DHT11 temperature and humidity sensor module 1 x infrared obstacle avoidance module 1 x potentiometer 10 x Dupont wire 1 x passive buzzer 1 x active buzzer 6 x tact switches 6 x tactile switch caps 10 x 1K resistor 1/4 10 x 10K resistors 1/4 10 x 220R resistor 1/4 10 x 4K7 resistor 1/4P 1 x 2.54MM pin header 40P 5 x red LED 5 x yellow LED 5 x green LED / 1 x 830 breadboard 1 x USB cable 1 x LM35DZ sensor 2 x 5528 photoresistors 1 x water level sensor module 1 x 1 digit display tube 1 x sound module 1 x RGB 3-color module 1 x DHT11 temperature and humidity sensor module 1 x infrared obstacle avoidance module 1 x potentiometer 10 x Dupont wire 1 x passive buzzer 1 x active buzzer 6 x tact switches 6 x tactile switch caps 10 x 1K resistor 1/4 10 x 10K resistors 1/4 10 x 220R resistor 1/4 10 x 4K7 resistor 1/4P 1 x 2.54MM pin header 40P 5 x red LED 5 x yellow LED 5 x green LED Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.