This is a Norgren CS8-2-04 magnetic reed switch, designed to detect the position of a piston inside a rodless cylinder. It's part of Norgren's 'A Series' for NFPA-style cylinders. Key specifications: It operates on 120V AC, handles 0.5 Amps and 10 VA, and comes with a 9-foot long lead wire for easy wiring. It's designed to fit cylinders with bore sizes ranging from 3/4 inch up to 2-1/2 inches. The switch is magnetically operated (uses a reed switch mechanism) and includes an LED indicator to show when it's activated. This is a crucial component for automation setups, letting your control system know when a cylinder has reached a specific point in its stroke. Perfect for machine builders, maintenance techs, or anyone working with pneumatic rodless cylinder actuators.