the lights are simply an indication of the depth, weather your in search or locate mode,
start off, searching, chuck the collar up the garden, as you get nearer to it in search mode, the lights will come down from left(highest away) to the right (lowest away, once the light is showing the min number, flick the switch over to locate, the lights should now go back to the left side, start waving the finder left and right, to pick up the collar, once the bleeps are heard, and a directection figured out, the lights will again, come from left to right, the closer you get, untill your directly on th