What is self-locking and reset: Self-locking: The switch is locked and then bounced back. Reset: Press the hand to power up, then press break. Describes: Rated range: AC250V 0.5A DC250V 0.5A Contact mode: A normally open contact (double break point slow-moving contact switch with two terminals) Electrical life: more than 100,000 times Mechanical life: more than 200,000 times Electrical strength: AC2000V 50Hz/60Hz Features: Ligt ring is a light-transmission LED light with power supply symbol switch. This product is a welding switch, welding iron temperature should not exceed 300 degrees, contact time should not exceed 1 second. Can be widely used in low - current door bells, access control, equipment start - up and tap start switch. Reset switch, press power, let go of power. Package: 1pc switch 1pc nut 1pc waterproof ring Note: Color is the color of the power symbol