The Bulldog Strike Sensor has a built in horn which signals you of a strike.  When many of us our out night fishing we are always playing around for ways to know if the fish hit the bait.  If you are not on top of it you may loose the fish.

The strike sensor allows you to set your dead stop/horn so it engages on the lightest to hardest hit.  You will know if you are tapping rocks and close to a snag or if a fish is hitting depending on the setting.

I also use the strike sensor trolling using planer boards at night as well.  I can adjust the strike sensors sensitivity for weeds as well as strikes.