DC 5-24V 12V 3-5A Flip-Flop Latch DPDT Relay Module Bistable Self-Locking Double Switch Board for Arduino UNO MEGA AVR LED (1): Amazon.com: Tools & Home Improvement
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switches - 2 led on latching pushbutton NO arduino - Electrical Engineering Stack Exchange
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Pushbutton and LED (Flip-Flop) | LabVIEW (LINX 3.0) with Arduino Uno - YouTube
Buttons — XOD
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How to Wire and Program a Button | Arduino Documentation