R Series pushbuttons improve design and durability of control panels and are available in 16 and 19 mm varieties. Flush-mounted pushbuttons are made of durable stainless steel for use in aggressive environments, such as ticketing machines, vending machines, and access control panels. These pushbuttons meet IP65 international standard for outside use, and offer mechanical service life of 1,000,000 operations within an operating temperature of -20 to 70°C.