the sensors use bluetooth to communicate to the control unit. all you need to do is connect the sensors to power and ground, conncet the control unit to power and ground, turn it on, sync the control unit with the sensors and your up and running.
it's also remote opperated, meaning you use a remote to switch between city/highway, control volume, and set the warning style to lights only, voice only, or voice and lights.
it's really a sweet setup. i need the cash so i have to part with it.
here's a link to k-40's website ---
http://k40.com/cali_main.html
check it out.