The 2A70 switch accessory from Honeywell is a push button switch designed for a variety of applications including transportation, industrial, mechanical, and medical fields. It is used to control electrical circuits by opening or closing contacts, thereby switching devices on or off. The switch features RoHS compliance and measures 27.4 x 21.6 mm, making it suitable for integration into machine tools, automatic drilling and tapping machines, and other control systems.