Relefree Mini Portable 2 in 1 Fish Bite Alarm Electronic Fishing LED Rod Tip Night Fishing Light Night Fishing Alarm Waterproof Automatic Tool Outdoor Sport An ideal indicator for night fishing, Red-Ready; Green-Fish On, Visible from 100 yards Apply to most of rods. Smart flash double base: Can be used in 1-5 mm rod used on top. A small base can be used in pole top with 1-3 mm, a large base can be used for 3 to 5 mm pole used on top Water-proof. Can be used in rain day. Power: by CR1225 button cell battery (included)