5V stepper motor 1 5V stepper motor driver board 1 1602LCD screen 1 Tricolor Patch 1 Big button 10 Plug-in punch (green breadboard) 1 water level 1 Bread line*65 1 Small button 5 Infrared receiver elements 1 LM35 elements 1 flame elements 1 mercury elements 1 Photosensitive elements 1 RFID RedBoard 1 keychain 1 1*8 pin header 1 5K adjustable potentiometer 1 HHC small motor 1 SR04 Ultrasonic 1 Four-digit digital tube 1 A digital tube 2 8*8 dot matrix 1 F5 LED White 6 F5 LED yellow 10 F5 LED green 10 F5 LED red 10 black rocker 1 F for R3 1 White card 1 USB cable 1 Active buzzer elements 1 Passive Buzzer Elements 1 10K adjustable potentiometer 1 IC 1 9g Servo 1 Single 5V Relay 1 1*40 straight needle 1 1*40 Looper 1 Female-to-Female Wire 10/row 1 830-well breadboard 1 6 AA battery box 1 595IC 1 4*4 Membrane Key 1 1K 5 10K 5 220R 8 Colour: as shown Material: ABS Size: 10x6x3cm Package Contents: 1 * Development Board Kit Only the above package content, other products are not included. Note: Light 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.