2 x 10K Ohm potentiometer potential + 2 x black control Knob

StarTech.com DB25 Slimline Gender Changer M/M - Serial / parallel gender changer - DB-25 (M) to DB-25 (M) - GC25SM

Uxcell a15082600ux0077 Carbon Linear Variable Potentiometer with Diameter Knob, WTH118-2W 10K Ohm

Cylewet 6Pcs V-153-1C25 Micro Limit Switch Long Straight Hinge Lever Arm SPDT Snap Action LOT for Arduino (Pack of 6) CYT1068

Talentcell Rechargeable 6000mAh Li-Ion Battery Pack for LED Strip and CCTV Camera,12V DC Portable Lithium Ion Battery Bank with Charger,Black

CNCdrive UC100 USB to Parallel CNC Motion Controller

Cylewet 12Pcs 1A 250V AC 2 Pins SPST Momentary Mini Push Button Switch Normal Open (Pack of 12) CYT1078

uxcell a15050500ux0776 Rotary Carbon Potentiometer with Diameter with Knob, RV24YN 20S B103 10K Ohm

Gikfun Solder-able Breadboard Gold Plated Finish Proto Board PCB DIY Kit for Arduino (Pack of 5PCS) GK1007

HQMaster CNC Router Bits 1/8 Router Bit 1 8 End Mill Flat Nose Carbide Endmill 2-Flute Spiral Upcut Milling Cutter Tool Set 17mm CEL, 38.5mm OAL for Wood Nylon Resin ABS Acrylic PVC MDF Hardwood 10Pcs

Elegoo EL-CP-004 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Wires Ribbon Cables Kit for arduino