This slide shows the proper activation required to select the three different priority sounds for model MSS5M1. To generate the low priority sounds, connect the positive (+) terminal to the +5Vdc supply and ground the “Low Priority” control pin. To generate the medium priority sound, connect the positive (+) terminal to the +5Vdc line and ground both the “Low Priority” and “Medium Priority” control pins. Similarly, for the high priority sound, ground both the “Low Priority” and “High Priority” control pins. Note that +5Vdc must be applied to the (+) pin and the “Low Priority” control pin must be grounded in order for any of the three tone sequences to be activated.