FSMIJ61BB04 is an illuminated tactile switch from the Alcoswitch FSMIJ series designed for through-hole mounting applications. It features a rectangular actuator style with a brown actuator color and operates in an Off (On) momentary function with a single pole-single throw configuration. The switch utilizes brass contact base material with silver plating for reliable electrical connections and has an operating force of 100gf. With blue LED illumination and a 6x6mm form factor, this tactile switch is suitable for user interface applications requiring visual feedback, such as control panels, consumer electronics, and industrial equipment.