12V Momentary Push Button Toggle Switch 3/4 Mounting Hole 1NO 1NC SPDT Brand Aluminum Alloy Horn Switch. LED Voltage: 12V only; Required Hole Size: 3/4" (19mm); Switch Rating: 250V/5A. This is a momentary push button switch: press and hold to turn ON, release to turn OFF. Contact configuration is 1NONC. Electrical life: 200,000 operations. Mechanical life: 1,000,000 cycles. Constructed from high-quality metal material with IP65 waterproof protection, making it suitable for wet or dusty environments.