How to Wire and Program a Button | Arduino Documentation | Arduino Documentation
What is a 4 Pin Switch? - YouTube
Arduino: Pushbutton
4.5x4.5mm Panel PCB Momentary Tactile Tact Mini Push Button Switch DIP 4pin 4.5x4.5x3.8/4.3/5/6/7/8/9/10 MM 4.5*4.5*3.8MM 10MM|Switches| - AliExpress
5Pcs 19mm 12V Waterproof ON Off Latching Push Button Switch with Wiring Harness and Led Indicator Light, 24V Pre-Wired SPDT Self-Locking 4 Pin Marine Metal Switch for Boats Cars Truck (Blue): Amazon.com: