The Festo SMTO-1-PS-K-LED-24C-SA is a proximity sensor from the SMTO series, listed under Limit and Proximity Switches.
The closest functional peer in the Festo family is the SME-1, a magneto-inductive proximity switch with a 220 V AC operating voltage and a 2.5 m cable. The SMTO-1-PS-K-LED-24C-SA is a different sensing principle (not magneto-inductive) and runs on 24 V DC with an LED indicator — it won't drop into a panel wired for the SME-1 without checking the supply voltage and output type.
