The button is adjusted through approach of pressing and rotates to release it. The switches are compactly structured and work quickly and smoothly. For emergency stop in the industry with the putting purple mushroom cap. Item name: emergency quit switch; Type: Red Mushroom cap; Input voltage: 250 V AC Input current: 3 to AC; Output voltage: 30 V DC; Output Current: 1 to DC Button color: red; Button diameter: 2 cm / zero inches; Size: 4 x 2 cm / 1 x zero inches (length x width) Mounting head hole diameter: 15 / zero inch; Material: Plastic and Metal Package content: 1 emergency stop swap