InnoTechRV TPMS Pressure Sensors

I have had the InnotechRV 10 Sensor Tire Pressure Monitoring System on my 5th wheel. I installed it about a year ago. Works great for me so far. I didn't install the locks on it because they are a pain to take off when you want to add air to the tires. After a while it shuts off on its own. Does anyone know if there is a setting so it will stay on all the time while traveling? I lost the owners manual and I can't find it online.