5-24v DC Power LED 
It is an IP65 rated product.
16mm : 4.5amp
 16mm : 7 pin = COM, NO, NC, 4 pins for LED.
High Quality Stainless Steel Material.
Yanwev Pvt. Ltd. Product By South Korea.
3 month replacement Guarantee.
Mounting Hole Diameter 16mm.
Tested for more than 30,000 presses.
Stainless steel material for long period use.
In-built illuminated LED.
Independent LED and Switch Terminals.
Good Electrical Conductivity.
Rubber ring and nut for fixing, Waterproof and dustproof.
NOTE :- Momentary means Horn type switch which works as it will be in ON position till you press it and will auto-reset itself as soon as you release it.