Momentary Switch: Press the button and hold--ON, Release--OFF; Electrical life: 100, 000 times, Mechanical life: 500,000 cycles Mounting Hole: 19mm(3/4"); Structure: 1NO; LED Light: 3A, 12V-24V, Halo Ring Red; LED life: 40,000 hours Protection Degree: IP66 Waterproof and dustproof; IK09 Anti-vandal rate. It can be used in wet or dusty environment; But Don’t immerse the button switch in water 2 wiring methods: LED light always on or illuminates when the device is working; 4 Brass terminals for connecting or soldering just as you like Wide Applications: Suitable for car, computer, instrument and meter industry, door bell, home appliance etc.