Turn on your wireless light bar before you turn on your monitor kit.
Plug the power jack into the back of the monitor kit, the other end into a 12V power source. Turn on the power switch located on the back panel of the monitor kit. The red LED will light and the alarm will sound momentarily while the monitor kit searches for the signal from the light bar. This will only last a second or two.
The battery indicator LEDs show your battery strength. All 3 LEDs indicate you have over 12.3V. 2 LEDs indicate you have between 11.3V and 12.3V. 1 LED indicates you have between 10.3V and 11.3V. No LEDs means your battery is below 10.3V and should be charged as soon as possible.
If the red LED on thr right side lights up, a 96db alarm will also sound. This means that your light bar is turned off, is below 3V or has gotten out of range of the monitor kit (possibly left behind or fallen off of the vehicle).
There is an approximate 4 second delay before the light and alarm come on. This is to make sure that some outside interference did not cause a temporary delay in the signal.