Just bought a Maverick ET-73...read all the instructions but I have one question... Do you turn off both the transmitter and the receiver when not using it? Seems like you would to save the batteries but they don't make it easy to turn off the transmitter. Have to open the battery compartment. I can do that but it seems like the would have put the switches on the outside of the case if that were so. Perhaps it's just weatherproofing.