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    Raspberry Pi 4 heatsink, compact aluminum cooling solution for thermal management of the Raspberry Pi 4 board.
    Raspberry Pi 4 Heatsink
    1 X  200 =  200
    2N3904 NPN Transistor (40V 0.2A)
    2N3904 NPN Transistor (40V 0.2A)
    1 X  8 =  8
    DS3225 25kg Metal Gear Digital Servo Motor
    DS3225 25kg Metal Gear Digital Servo Motor
    1 X  3,500 =  3,500
    LM393 sound sensor module for detecting sound levels.
    LM393 Sound Detection Sensor Module
    1 X  130 =  130
    1.3-inch OLED display module with I²C/SPI interface.
    1.3 Inch 128×64 OLED Display Module
    1 X  800 =  800
    4-slot 18650 battery cell holder for DIY electronics and power projects
    4x 18650 Battery Case Cell Holder
    1 X  120 =  120
    Arduino Uno microcontroller board (DIP version), ATmega328P-based board for electronics and robotics projects.
    Arduino Uno R3 DIP Board with Free USB Cable
    1 X  1,450 =  1,450
    ULN2003 stepper motor driver module with input pins and output connector for controlling 28BYJ-48 stepper motors.
    ULN2003 Stepper Motor Driver Board
    1 X  100 =  100