This shows the loc8tor lite device with my custom board sitting on top. The Voltage Divider is basically two resisters that reduce the voltage from 5V to 3V. This allows the Loc8tor Lite board to be driven off the Arduino's power supply.
Two transistor are used to toggle the Loc8tor Lite Power and Scan switches. These switches are tactile switches that I've removed and wired directly into the transistor; applying a current to the Base effectively grounds the two ends as if the button has been pressed.
The Piezo Sounder feed comes directly off the Loc8tor Lite board and goes directly into a port of the Arduino side.