10pcs 2 Pin-2Pin Dupont Wire Female to Female Cable Line 2.54mm for Arduino 30cm | eBay
1.25mm Pitch 2-pin Cable Matching Pair - 40cm long [Molex PicoBlade Compatible] : ID 4720 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Touchless 20 second musical handwashing timer - Arduino Project Hub
20PCS/Lot 2.54mm Single Row 40 Pins Male Female Pin Header Breakable Extension PCB Socket Plug Board Connector Strip for Arduino| | - AliExpress
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40-pin FPC to Straight 2x20 IDC Female Socket Header : ID 4905 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: HiLetgo 2pcs UNO R3 Proto Shield Prototype Expansion Board with SYB-170 Mini Breadboard Based for Arduino UNO R3 ProtoShield : Industrial & Scientific
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Turn Any Appliance into a Smart Device with an Arduino Controlled Power Outlet