Pet Stop Indoor Battery Powered Transmitter Operator's Manual page 6

Transmitter Controls / Indicators
Transmission LED:
This LED will illuminate at the end of a transmission packet. This will
let you know the transmitter is functional and assist in ascertaining
range – receiver should activate when light illuminates.
Range Control:
Sets range of transmission. Rotate Clockwise for maximum,
Counter-Clockwise for minimum. Battery life will be maximized by
setting the control to as short of range as practical for the
application.
Duration and Repetition Switches:
These four switches set the transmission duration and the repetition
rate.
6 | P a g e