This is a two-way deflection switch, meaning it can be activated in either direction. It takes 4 oz. of force to activate the switch. The leaf is 3-3/4″ long, and is encased in a soft, non-abrasive red vinyl sleeve for use in tight access areas (between upper or lower arm and trunk, thighs, knees, under chin, etc.). The switch is normally open and is activated by deflecting the leaf. Not recommended for use where auditory or tactile feedback is required. The base of the switch is a block with a locking screw for mounting.