This light is designed to go right on your line. Use the bands on the body of the light to run your line though and then tie a swivel on the line. Add a short leader and hook and you are set. Comes with rubber bands to hold the tube in place. You can move the light up and down the line to find the right mix. The lights are water tight to 100 feet depths. Come with a battery good for 14 hours. Replacement batteries are available. The design of the light puts the light by the bait not on the water eliminating the bugs that other lights create. Candles are lite weight and act as a weight and doesn't affect rod performance. Crappie Candle carry a life time warranty(batteries not included) A real innovation in night time fishing. $12.95 each.