The Berkley Bite Indicator LED is a tool that detects when fish strike by monitoring the line for slight movements. Alerts every time you have a bite. Snaps on to rod. Use LED light alert when night fishing and sound alert when fishing in the daytime. Berkley's small bite indicator detects even the subtlest of strikes whether used for trolling, bank fishing or ice fishing. Anglers can adjust the sensitivity of the bite detector to differentiate small nibbles from full pickups. This indicator also includes a tilt mode that alerts the angler if the rod is bent more than it should be when trolling or using heavy weights. The bite indicator fits most fishing rods.