The HA2 is the direct replacement for the Sure Action 111. The HA2 is an improved two-zone multi purpose processor. Handles up to (4) ENHP Pulsors, (4) HPP Pulsors or (1) Standard P5050 Probe. Operating voltage is 12 VDC. For use with Sure Action's Pulsors; a one-of-a-kind sensor manufactured only by Sure Action. These sensors are epoxied to the bottom of a floor joist, ladder or boat decking. When an individual steps on the material, the sensor detects the movement of the joist or decking and triggers the alarm.