Light up your rod-n-bobbers and fish after dark. Virtually any rod or bobber can be converted to low light fishing use. This patented product fits all fishing rods (ultra-light to heavy). Also fits slip or spring-stick bobbers as well as round plastic bobbers of all sizes. Contents:1 Green Luck Jack Battery, 1 light diffuser and 5 holders. Recommended For: Pan Fish, Walleye, Steelhead, Bass & Catfish.