Silent Knight PS-DALOBThe single action pull station is activated by a single pull down of the alarm handle. The dual action versions require pushing in the handle, then pulling the handle down for activation. The PSDA PS SA manual pull stations are UL listed and meet the ADA requirement of a 5 lbs. maximum pull force to activate. Operating instructions are molded into the handle along with Braille text. Molded terminal numbers can be found adjacent to the wiring terminals.