Mailbox Sensor Installation

I received my new mailbox sensor, but there were no installation instructions included. I searched the Ring website and internet and also could not find anything.- Does anyone know what the switch is inside of the battery box and if I need to change it?- Is the round grommet placed on the cable end at the box, or somewhere else? - Does the sensor need to be placed like in the photos on the door, or can it be placed anywhere within the mailbox if the external antenna is used?Anything else I need to know?Thanks,Mitch